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Swift Tour 随笔总结 (4)

Switch的一个例子:

let vegetable = "red pepper"switch vegetable {case "celery":    let vegetableComment = "Add some raisins and make ants on a log."case "cucumber", "watercress":    let vegetableComment = "That would make a agood tea sandwich."case let x where  x.hasSuffix("pepper"):    let vegetableComment = "Is it a spicy \(x)?"default:    let vegetableComment = "Everything tastes good in soup."}

比起传统的oc有一些新特性,接受了就好挺实用的

不用break

for的拓展

for-in

let interestingNumbers = [    "Prime": [2, 3, 5, 7, 11, 13],    "Fibonacci": [1, 1, 2, 3, 5, 8],    "Square": [1, 4, 9, 16, 25]]var largest = 0for (kind, numbers) in interestingNumbers {    for number in numbers {        if number > largest {            largest = number        }    }}largest

while/do while保持一致

其他for的拓展用法

var firstForLoop = 0for i in 0..3{firstForLoop += i}firstForLoopvar secondForLoop = 0for var i = 0; i < 3; ++i {    secondForLoop += 1}secondForLoop

用过适用 … 代替 .. 则包含upper value(<和<=的差别)

Functions and Closures

func greet(name: String, day: String) -> String {    returrn "Hellop \(name), today is \(day)."}greet("Bob", "Tuesday")//使用tuple来返回多个值func getGasPrices() -> (Double, Double, Double) {    return (3.59, 3.69, 3.79)}getGasPrices()

func会使用数组收集多个变量:

func sumOf(numbers: Int...) -> Int {    var sum = 0    for number in numbers {        sum += number    }    return sum}sumOf()sumOf(42, 597, 12)

函数的下次接着写吧,挺多的T T

Swift Tour 随笔总结 (4)