2016-08-01

Swift 3.0 更改項目

更改項目說明

SE-0002: Removing currying func declaration syntax

// Before:
func curried(x: Int)(y: String) -> Float {
  return Float(x) + Float(y)!
}

// After:
func curried(x: Int) -> (String) -> Float {
  return {(y: String) -> Float in
    return Float(x) + Float(y)!
  }
}

SE-0003: Removing var from Function Parameters

為了避免使用者混淆 inout 宣告，所以移除 Parameters var

func doSomethingWithVar(var i: Int) {
  i = 2 // This will NOT have an effect on the caller's Int that was passed, but i can be modified locally
}

func doSomethingWithInout(inout i: Int) {
  i = 2 // This will have an effect on the caller's Int that was passed.
}

var x = 1
print(x) // 1

doSomethingWithVar(x)
print(x) // 1

doSomethingWithInout(&x)
print(x) // 2

SE-0004: Remove the ++ and – operators

移除
let a = ++x  // pre-increment  - returns input value after mutation
let b = x++  // post-increment - returns copy of input value before mutation
let c = --x  // pre-decrement  - returns input value after mutation
let d = x--  // post-decrement - returns copy of input value before mutation


改用
x += 1
x -= 1

SE-0005: Better Translation of Objective-C APIs Into Swift

改進整合 OBJ-C API 到 Swift 中

SE-0006: Apply API Guidelines to the Standard Library

改一些 API 名稱

SE-0007: Remove C-style for-loops with conditions and incrementers

移除 C 語言的 for-loop，改用 Swift 的 for-in 和 stride

SE-0008: Add a Lazy flatMap for Sequences of Optionals

flatMap 有兩種版本寫法，原本只有其中一種有 lazy，現在另外一種也支援 lazy-flatmap-for-optionals

SE-0016: Adding initializers to Int and UInt to convert from UnsafePointer and UnsafeMutablePointer

加強 Swift pointer 的運算

SE-0017: Change Unmanaged to use UnsafePointer

SE-0019: Swift Testing

測試 module 改進

SE-0023: API Design Guidelines

改進說明

SE-0028: Modernizing Swift’s Debugging Identifiers (FILE, etc)

將原本 Snake case 命名改掉
__FILE__        -> #file
__LINE__        -> #line
__COLUMN__      -> #column
__FUNCTION__    -> #function (Added during review)
__DSO_HANDLE__  -> #dsohandle