Metadata

Key	Value
engine	vllm
prompt	default
temp	0.2
top_p	0.95
max_new_tokens	1024
n_completions	10

Solutions

Problem #1

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // Handle any parsing errors and throw a ParsingError
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // Handle any parsing errors and throw a ParsingError
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // If parsing fails, throw a ParsingError.invalidInput
    // If an internal error occurs, throw a ParsingError.internalError(Error)
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // If parsing fails, throw a ParsingError.invalidInput
    // If an internal error occurs, throw a ParsingError.internalError(Error)
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Your code here
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // Return the parsed JSON object
    // Handle any parsing errors and throw a ParsingError
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    // Parse the string into a JSON object
    // Return the parsed JSON object
    // Handle any parsing errors and throw a ParsingError
}

} // missing return in global function expected to return 'JSON' (aka 'Dictionary<String, Any>')

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
        return json
    } catch {
        throw ParsingError.internalError(error)
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
        return json
    } catch {
        throw ParsingError.internalError(error)
    }
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
    } catch {
        throw ParsingError.internalError(error)
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
    } catch {
        throw ParsingError.internalError(error)
    }
}

typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
        return json
    } catch {
        throw ParsingError.internalError(error)
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
JSON parser, returns custom error type in case of failures.

Answer:
```swift
typealias JSON = [String: Any]

enum ParsingError: Error {
    case invalidInput
    case internalError(Error)
}

func parse(string: String) throws -> JSON {
    do {
        let data = string.data(using: .utf8)!
        let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
        return json
    } catch {
        throw ParsingError.internalError(error)
    }
}

Problem #2

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let root = HTMLNode.element("div", attributes: ["id": "root"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"])
])

print(generate(root))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var html = "<\(name)"
        for (key, value) in attributes {
            html += " \(key)=\"\(value)\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</\(name)>"
        return html
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var html = "<\(name)"
        for (key, value) in attributes {
            html += " \(key)=\"\(value)\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</\(name)>"
        return html
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"]),
])

print(generate(tree))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var html = "<\(name)"
        for (key, value) in attributes {
            html += " \(key)=\"\(value)\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</\(name)>"
        return html
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var html = "<\(name)"
        for (key, value) in attributes {
            html += " \(key)=\"\(value)\""
        }
        html += ">"
        for child in children {
            html += generate(child)
        }
        html += "</\(name)>"
        return html
    }
}

let tree = HTMLNode.element("div", attributes: ["id": "swifteval"], children: [
    HTMLNode.element("a", attributes: ["href": "https://swift.org"]),
])

print(generate(tree))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"]),
])

print(generate(tree))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"]),
])

print(generate(tree))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"]),
])

print(generate(tree))

indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
HTML generator from predefined elements tree.
Output with standart HTML like this "<div><a href="swifteval"></a></div>"

Answer:
```swift
indirect enum HTMLNode {
    case text(_ content: String)
    case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}

func generate(_ tree: HTMLNode) -> String {
    switch tree {
    case let .text(content):
        return content
    case let .element(name, attributes, children):
        var result = "<\(name)"
        for (key, value) in attributes {
            result += " \(key)=\"\(value)\""
        }
        result += ">"
        for child in children {
            result += generate(child)
        }
        result += "</\(name)>"
        return result
    }
}

let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
    HTMLNode.element("a", attributes: ["href": "swifteval"]),
])

print(generate(tree))

Problem #3

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operator: String?

    for token in string.tokens {
        switch token {
        case let number as Double:
            stack.append(number)
        case let operator in "+-*/()":
            guard let last = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            let second = stack.popLast() ?? 0
            let first = stack.popLast() ?? 0

            switch operator {
            case "+":
                stack.append(first + second)
            case "-":
                stack.append(first - second)
            case "*":
                stack.append(first * second)
            case "/":
                stack.append(first / second)
            case "(":
                operator.withCString {
                    stack.append(last)
                }
            case ")":
                break
            default:
                throw CalculateError.invalidInput
            }
        default:
            throw CalculateError.invalidInput
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operator: String?

    for token in string.tokens {
        switch token {
        case let number as Double:
            stack.append(number)
        case let operator in "+-*/()":
            guard let last = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            let second = stack.popLast() ?? 0
            let first = stack.popLast() ?? 0

            switch operator {
            case "+":
                stack.append(first + second)
            case "-":
                stack.append(first - second)
            case "*":
                stack.append(first * second)
            case "/":
                stack.append(first / second)
            case "(":
                operator.withCString {
                    stack.append(last)
                }
            case ")":
                break
            default:
                throw CalculateError.invalidInput
            }
        default:
            throw CalculateError.invalidInput
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

var operator: String? // keyword 'operator' cannot be used as an identifier here

for token in string.tokens { // value of type 'String' has no member 'tokens'

case let operator in "+-*/()": // expected ':' after 'case'

case let operator in "+-*/()": // expected pattern

case let operator in "+-*/()": // expected operator name in operator declaration

switch operator { // expected expression in 'switch' statement

switch operator { // expected operator name in operator declaration

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operatorStack = [Character]()

    for token in string.tokens {
        switch token {
        case let number as Double:
            stack.append(number)
        case let operator as Character:
            guard let left = stack.popLast(), let right = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            switch operator {
            case "+":
                stack.append(left + right)
            case "-":
                stack.append(left - right)
            case "*":
                stack.append(left * right)
            case "/":
                stack.append(left / right)
            default:
                throw CalculateError.invalidInput
            }
        default:
            throw CalculateError.invalidInput
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operatorStack = [Character]()

    for token in string.tokens {
        switch token {
        case let number as Double:
            stack.append(number)
        case let operator as Character:
            guard let left = stack.popLast(), let right = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            switch operator {
            case "+":
                stack.append(left + right)
            case "-":
                stack.append(left - right)
            case "*":
                stack.append(left * right)
            case "/":
                stack.append(left / right)
            default:
                throw CalculateError.invalidInput
            }
        default:
            throw CalculateError.invalidInput
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

for token in string.tokens { // value of type 'String' has no member 'tokens'

case let operator as Character: // expected ':' after 'case'

case let operator as Character: // labels are only valid on loops, if, and switch statements

case let operator as Character: // expected pattern

case let operator as Character: // expected operator name in operator declaration

switch operator { // expected operator name in operator declaration

switch operator { // expected expression in 'switch' statement

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack: [Double] = []
    var operator: String? = nil

    for token in string.tokens {
        if let number = Double(token) {
            stack.append(number)
        } else if let op = operator {
            guard let a = stack.popLast(), let b = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            switch op {
            case "+":
                stack.append(a + b)
            case "-":
                stack.append(a - b)
            case "*":
                stack.append(a * b)
            case "/":
                stack.append(a / b)
            default:
                throw CalculateError.invalidInput
            }
            operator = nil
        } else {
            operator = token
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack: [Double] = []
    var operator: String? = nil

    for token in string.tokens {
        if let number = Double(token) {
            stack.append(number)
        } else if let op = operator {
            guard let a = stack.popLast(), let b = stack.popLast() else {
                throw CalculateError.invalidInput
            }
            switch op {
            case "+":
                stack.append(a + b)
            case "-":
                stack.append(a - b)
            case "*":
                stack.append(a * b)
            case "/":
                stack.append(a / b)
            default:
                throw CalculateError.invalidInput
            }
            operator = nil
        } else {
            operator = token
        }
    }

    guard let result = stack.popLast() else {
        throw CalculateError.invalidInput
    }

    return result
}

var operator: String? = nil // keyword 'operator' cannot be used as an identifier here

for token in string.tokens { // value of type 'String' has no member 'tokens'

} else if let op = operator { // expected expression after '=' in conditional binding

} else if let op = operator { // expected '{' after 'if' condition

operator = nil // 'operator' may only be declared at file scope

operator = nil // operator must be declared as 'prefix', 'postfix', or 'infix'

operator = token // operator must be declared as 'prefix', 'postfix', or 'infix'

operator = token // 'operator' may only be declared at file scope

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    while tokenIndex < string.count {
        let token = string[string.index(string.startIndex, offsetBy: tokenIndex)]
        switch token {
        case "(":
            stack.append(0)
        case ")":
            let left = stack.removeLast()
            let right = stack.removeLast()
            let result = try calculate("\(left)\(token)\(right)")
            stack.append(result)
        case "+":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left + right)
        case "-":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left - right)
        case "*":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left * right)
        case "/":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left / right)
        default:
            if let number = Double(token) {
                stack.append(number)
            } else {
                throw CalculateError.invalidInput
            }
        }
        tokenIndex += 1
    }
    return stack.removeLast()
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    while tokenIndex < string.count {
        let token = string[string.index(string.startIndex, offsetBy: tokenIndex)]
        switch token {
        case "(":
            stack.append(0)
        case ")":
            let left = stack.removeLast()
            let right = stack.removeLast()
            let result = try calculate("\(left)\(token)\(right)")
            stack.append(result)
        case "+":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left + right)
        case "-":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left - right)
        case "*":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left * right)
        case "/":
            let right = stack.removeLast()
            let left = stack.removeLast()
            stack.append(left / right)
        default:
            if let number = Double(token) {
                stack.append(number)
            } else {
                throw CalculateError.invalidInput
            }
        }
        tokenIndex += 1
    }
    return stack.removeLast()
}

if let number = Double(token) { // cannot convert value of type 'Character' to expected argument type 'Substring'

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    var token = ""

    while tokenIndex < string.count {
        let currentCharacter = string[string.index(string.startIndex, offsetBy: tokenIndex)]

        if currentCharacter == " " {
            tokenIndex += 1
            continue
        }

        if currentCharacter == "(" {
            stack.append(calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...])))
            tokenIndex += 1
            continue
        }

        if currentCharacter == ")" {
            let result = stack.removeLast()
            stack.append(result)
            tokenIndex += 1
            continue
        }

        if currentCharacter == "+" || currentCharacter == "-" || currentCharacter == "*" || currentCharacter == "/" {
            let result = calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...]))
            let firstNumber = stack.removeLast()
            let secondNumber = stack.removeLast()

            switch currentCharacter {
            case "+":
                stack.append(firstNumber + secondNumber)
            case "-":
                stack.append(firstNumber - secondNumber)
            case "*":
                stack.append(firstNumber * secondNumber)
            case "/":
                stack.append(firstNumber / secondNumber)
            default:
                throw CalculateError.invalidInput
            }

            tokenIndex += 1
            continue
        }

        token += currentCharacter
        tokenIndex += 1
    }

    if let number = Double(token) {
        stack.append(number)
    }

    return stack.removeLast()
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    var token = ""

    while tokenIndex < string.count {
        let currentCharacter = string[string.index(string.startIndex, offsetBy: tokenIndex)]

        if currentCharacter == " " {
            tokenIndex += 1
            continue
        }

        if currentCharacter == "(" {
            stack.append(calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...])))
            tokenIndex += 1
            continue
        }

        if currentCharacter == ")" {
            let result = stack.removeLast()
            stack.append(result)
            tokenIndex += 1
            continue
        }

        if currentCharacter == "+" || currentCharacter == "-" || currentCharacter == "*" || currentCharacter == "/" {
            let result = calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...]))
            let firstNumber = stack.removeLast()
            let secondNumber = stack.removeLast()

            switch currentCharacter {
            case "+":
                stack.append(firstNumber + secondNumber)
            case "-":
                stack.append(firstNumber - secondNumber)
            case "*":
                stack.append(firstNumber * secondNumber)
            case "/":
                stack.append(firstNumber / secondNumber)
            default:
                throw CalculateError.invalidInput
            }

            tokenIndex += 1
            continue
        }

        token += currentCharacter
        tokenIndex += 1
    }

    if let number = Double(token) {
        stack.append(number)
    }

    return stack.removeLast()
}

stack.append(calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...]))) // call can throw but is not marked with 'try'

let result = calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...])) // call can throw but is not marked with 'try'

token += currentCharacter // cannot convert value of type 'Character' to expected argument type 'String'

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operator: String?

    for token in string.tokens {
        if let number = Double(token) {
            stack.append(number)
        } else if let operator = operator {
            if let first = stack.popLast(), let second = stack.popLast() {
                switch operator {
                case "+":
                    stack.append(first + second)
                case "-":
                    stack.append(first - second)
                case "*":
                    stack.append(first * second)
                case "/":
                    stack.append(first / second)
                default:
                    throw CalculateError.invalidInput
                }
            } else {
                throw CalculateError.invalidInput
            }
        } else {
            operator = token
        }
    }

    if let result = stack.first {
        return result
    } else {
        throw CalculateError.invalidInput
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var operator: String?

    for token in string.tokens {
        if let number = Double(token) {
            stack.append(number)
        } else if let operator = operator {
            if let first = stack.popLast(), let second = stack.popLast() {
                switch operator {
                case "+":
                    stack.append(first + second)
                case "-":
                    stack.append(first - second)
                case "*":
                    stack.append(first * second)
                case "/":
                    stack.append(first / second)
                default:
                    throw CalculateError.invalidInput
                }
            } else {
                throw CalculateError.invalidInput
            }
        } else {
            operator = token
        }
    }

    if let result = stack.first {
        return result
    } else {
        throw CalculateError.invalidInput
    }
}

var operator: String? // keyword 'operator' cannot be used as an identifier here

for token in string.tokens { // value of type 'String' has no member 'tokens'

} else if let operator = operator { // expected '{' after 'if' condition

} else if let operator = operator { // unwrap condition requires a valid identifier

} else if let operator = operator { // expected pattern

switch operator { // expected expression in 'switch' statement

switch operator { // expected operator name in operator declaration

operator = token // operator must be declared as 'prefix', 'postfix', or 'infix'

operator = token // 'operator' may only be declared at file scope

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber = 0.0
    var operator = ""
    var isNumber = true

    for char in string {
        if char.isDigit {
            currentNumber = currentNumber * 10 + Double(String(char))!
        } else if char == "+" || char == "-" || char == "*" || char == "/" {
            if isNumber {
                stack.append(currentNumber)
                currentNumber = 0.0
                isNumber = false
            }
            operator = String(char)
        } else if char == "(" {
            stack.append(currentNumber)
            currentNumber = 0.0
            isNumber = false
        } else if char == ")" {
            while let top = stack.popLast() {
                if let secondTop = stack.popLast() {
                    let result = calculate(top.description + operator + secondTop.description)
                    stack.append(result)
                } else {
                    stack.append(top)
                }
            }
        }
    }

    if !stack.isEmpty {
        return stack.removeFirst()
    } else {
        throw CalculateError.invalidInput
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber = 0.0
    var operator = ""
    var isNumber = true

    for char in string {
        if char.isDigit {
            currentNumber = currentNumber * 10 + Double(String(char))!
        } else if char == "+" || char == "-" || char == "*" || char == "/" {
            if isNumber {
                stack.append(currentNumber)
                currentNumber = 0.0
                isNumber = false
            }
            operator = String(char)
        } else if char == "(" {
            stack.append(currentNumber)
            currentNumber = 0.0
            isNumber = false
        } else if char == ")" {
            while let top = stack.popLast() {
                if let secondTop = stack.popLast() {
                    let result = calculate(top.description + operator + secondTop.description)
                    stack.append(result)
                } else {
                    stack.append(top)
                }
            }
        }
    }

    if !stack.isEmpty {
        return stack.removeFirst()
    } else {
        throw CalculateError.invalidInput
    }
}

var operator = "" // keyword 'operator' cannot be used as an identifier here

if char.isDigit { // value of type 'Character' has no member 'isDigit'

operator = String(char) // operator must be declared as 'prefix', 'postfix', or 'infix'

operator = String(char) // 'operator' may only be declared at file scope

let result = calculate(top.description + operator + secondTop.description) // 'operator' may only be declared at file scope

let result = calculate(top.description + operator + secondTop.description) // missing argument for parameter #1 in call

let result = calculate(top.description + operator + secondTop.description) // consecutive statements on a line must be separated by ';'

let result = calculate(top.description + operator + secondTop.description) // expected expression after operator

let result = calculate(top.description + operator + secondTop.description) // operator must be declared as 'prefix', 'postfix', or 'infix'

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber: Double = 0
    var currentOperator: String = ""

    for char in string {
        if let number = Double(String(char)) {
            currentNumber *= 10
            currentNumber += number
        } else if char == "+" || char == "-" || char == "*" || char == "/" {
            if currentOperator != "" {
                let result = calculate(stack.popLast()!, currentOperator, currentNumber)
                stack.append(result)
                currentNumber = 0
            }
            currentOperator = String(char)
        } else if char == "(" {
            stack.append(currentNumber)
            currentNumber = 0
        } else if char == ")" {
            let result = calculate(stack.popLast()!, currentOperator, currentNumber)
            stack.append(result)
            currentNumber = 0
            currentOperator = ""
        }
    }

    if currentOperator != "" {
        let result = calculate(stack.popLast()!, currentOperator, currentNumber)
        stack.append(result)
    }

    return stack.popLast()!
}

func calculate(_ number1: Double, _ operator: String, _ number2: Double) -> Double {
    switch operator {
    case "+":
        return number1 + number2
    case "-":
        return number1 - number2
    case "*":
        return number1 * number2
    case "/":
        return number1 / number2
    default:
        throw CalculateError.invalidInput
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber: Double = 0
    var currentOperator: String = ""

    for char in string {
        if let number = Double(String(char)) {
            currentNumber *= 10
            currentNumber += number
        } else if char == "+" || char == "-" || char == "*" || char == "/" {
            if currentOperator != "" {
                let result = calculate(stack.popLast()!, currentOperator, currentNumber)
                stack.append(result)
                currentNumber = 0
            }
            currentOperator = String(char)
        } else if char == "(" {
            stack.append(currentNumber)
            currentNumber = 0
        } else if char == ")" {
            let result = calculate(stack.popLast()!, currentOperator, currentNumber)
            stack.append(result)
            currentNumber = 0
            currentOperator = ""
        }
    }

    if currentOperator != "" {
        let result = calculate(stack.popLast()!, currentOperator, currentNumber)
        stack.append(result)
    }

    return stack.popLast()!
}

func calculate(_ number1: Double, _ operator: String, _ number2: Double) -> Double {
    switch operator {
    case "+":
        return number1 + number2
    case "-":
        return number1 - number2
    case "*":
        return number1 * number2
    case "/":
        return number1 / number2
    default:
        throw CalculateError.invalidInput
    }
}

switch operator { // expected expression in 'switch' statement

switch operator { // expected operator name in operator declaration

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber: Double = 0
    var currentOperator: String = ""

    for character in string {
        switch character {
        case " ":
            continue
        case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
            currentNumber *= 10
            currentNumber += Double(String(character))!
        case "+":
            if let lastNumber = stack.last {
                stack.append(lastNumber + currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "+"
        case "-":
            if let lastNumber = stack.last {
                stack.append(lastNumber - currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "-"
        case "*":
            if let lastNumber = stack.last {
                stack.append(lastNumber * currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "*"
        case "/":
            if let lastNumber = stack.last {
                stack.append(lastNumber / currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "/"
        case "(":
            stack.append(currentNumber)
            currentNumber = 0
        case ")":
            while let lastOperator = stack.last, lastOperator != "(" {
                if let lastNumber = stack.popLast() {
                    if currentOperator == "+" {
                        stack.append(lastNumber + lastOperator)
                    } else if currentOperator == "-" {
                        stack.append(lastNumber - lastOperator)
                    } else if currentOperator == "*" {
                        stack.append(lastNumber * lastOperator)
                    } else if currentOperator == "/" {
                        stack.append(lastNumber / lastOperator)
                    }
                }
            }
            currentOperator = ""
        default:
            throw CalculateError.invalidInput
        }
    }

    if let lastNumber = stack.last {
        return lastNumber
    } else {
        throw CalculateError.invalidInput
    }
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var currentNumber: Double = 0
    var currentOperator: String = ""

    for character in string {
        switch character {
        case " ":
            continue
        case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9":
            currentNumber *= 10
            currentNumber += Double(String(character))!
        case "+":
            if let lastNumber = stack.last {
                stack.append(lastNumber + currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "+"
        case "-":
            if let lastNumber = stack.last {
                stack.append(lastNumber - currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "-"
        case "*":
            if let lastNumber = stack.last {
                stack.append(lastNumber * currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "*"
        case "/":
            if let lastNumber = stack.last {
                stack.append(lastNumber / currentNumber)
                currentNumber = 0
            } else {
                stack.append(currentNumber)
            }
            currentOperator = "/"
        case "(":
            stack.append(currentNumber)
            currentNumber = 0
        case ")":
            while let lastOperator = stack.last, lastOperator != "(" {
                if let lastNumber = stack.popLast() {
                    if currentOperator == "+" {
                        stack.append(lastNumber + lastOperator)
                    } else if currentOperator == "-" {
                        stack.append(lastNumber - lastOperator)
                    } else if currentOperator == "*" {
                        stack.append(lastNumber * lastOperator)
                    } else if currentOperator == "/" {
                        stack.append(lastNumber / lastOperator)
                    }
                }
            }
            currentOperator = ""
        default:
            throw CalculateError.invalidInput
        }
    }

    if let lastNumber = stack.last {
        return lastNumber
    } else {
        throw CalculateError.invalidInput
    }
}

while let lastOperator = stack.last, lastOperator != "(" { // cannot convert value of type 'String' to expected argument type 'Double'

enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    while tokenIndex < string.count {
        let token = string[string.index(string.startIndex, offsetBy: tokenIndex)]
        switch token {
        case "(":
            stack.append(try calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...])))
            tokenIndex += 1
        case ")":
            let right = stack.removeLast()
            let left = stack.removeLast()
            switch string[string.index(string.startIndex, offsetBy: tokenIndex + 1)] {
            case "+":
                stack.append(left + right)
            case "-":
                stack.append(left - right)
            case "*":
                stack.append(left * right)
            case "/":
                stack.append(left / right)
            default:
                throw CalculateError.invalidInput
            }
            tokenIndex += 1
        default:
            if let number = Double(String(token)) {
                stack.append(number)
            } else {
                throw CalculateError.invalidInput
            }
        }
        tokenIndex += 1
    }
    return stack.removeLast()
}

Question:
Write code in Swift programming language. Don't include usage examples or tests.
Calculator which supports operations from readable string format.
Valid tokens is "+-*/()", example input is "2+2*2".

Answer:
```swift
enum CalculateError: Error {
    case invalidInput
}

func calculate(_ string: String) throws -> Double {
    var stack = [Double]()
    var tokenIndex = 0
    while tokenIndex < string.count {
        let token = string[string.index(string.startIndex, offsetBy: tokenIndex)]
        switch token {
        case "(":
            stack.append(try calculate(String(string[string.index(string.startIndex, offsetBy: tokenIndex + 1)...])))
            tokenIndex += 1
        case ")":
            let right = stack.removeLast()
            let left = stack.removeLast()
            switch string[string.index(string.startIndex, offsetBy: tokenIndex + 1)] {
            case "+":
                stack.append(left + right)
            case "-":
                stack.append(left - right)
            case "*":
                stack.append(left * right)
            case "/":
                stack.append(left / right)
            default:
                throw CalculateError.invalidInput
            }
            tokenIndex += 1
        default:
            if let number = Double(String(token)) {
                stack.append(number)
            } else {
                throw CalculateError.invalidInput
            }
        }
        tokenIndex += 1
    }
    return stack.removeLast()
}

 // Fatal error: Error raised at top level: Solution.CalculateError.invalidInput

Metadata

Solutions

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed

Compiled Passed