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- more examples
- add custom operator example
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@ -26,9 +26,9 @@ let `class` = "keyword" // backticks allow keywords to be used as variable names
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let explicitDouble: Double = 70
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let intValue = 0007 // 7
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let largeIntValue = 77_000 // 77000
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let label = "some text " + String(myVariable) // Casting
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let piText = "Pi = \(myConstant)" // String interpolation
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var optionalString: String? = "optional" // Can be nil
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let label = "some text " + String(myVariable) // Casting
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let piText = "Pi = \(myConstant), Pi 2 = \(myConstant * 2)" // String interpolation
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var optionalString: String? = "optional" // Can be nil
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optionalString = nil
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/*
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@ -114,7 +114,17 @@ default: // required (in order to cover all possible input)
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// Functions are a first-class type, meaning they can be nested
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// in functions and can be passed around
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// Function
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// Function with Swift docs
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/**
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A greet operation
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- A bullet in docs
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- Another bullet in the docs
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:param: name A name
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:param: day A day
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:returns: A string containing the name and day value.
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*/
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func greet(name: String, day: String) -> String {
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return "Hello \(name), today is \(day)."
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}
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@ -237,6 +247,11 @@ print(mySquare.getArea()) // 25
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mySquare.shrink()
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print(mySquare.sideLength) // 4
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// compare instances, not the same as == which compares objects (equal to)
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if mySquare === mySquare {
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println("Yep its mySquare")
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}
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//
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// MARK: Enums
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@ -276,6 +291,20 @@ extension Square: Printable {
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println("Square: \(mySquare)")
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// You can also extend built-in types
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extension Int {
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var customProperty: String {
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return "This is \(self)"
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}
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func multiplyBy(num: Int) -> Int {
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return num * self
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}
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}
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println(7.customProperty) // "This is 7"
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println(14.multiplyBy(2)) // 42
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// Generics: Similar to Java. Use the `where` keyword to specify the
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// requirements of the generics.
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@ -288,4 +317,21 @@ func findIndex<T: Equatable>(array: [T], valueToFind: T) -> Int? {
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return nil
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}
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// Operators:
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// Custom operators can start with the characters:
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// / = - + * % < > ! & | ^ . ~
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// or
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// Unicode math, symbol, arrow, dingbat, and line/box drawing characters.
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prefix operator !!! {}
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// An operator that triples the side length when used
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prefix func !!! (inout shape: Square) -> Square {
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shape.sideLength *= 3
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return shape
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}
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let bigSquare = !!!mySquare
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println(bigSquare.sideLength)
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```
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