本文共 1284 字,大约阅读时间需要 4 分钟。
常见的实现,
要熟悉了解,
至于闭包逃逸,
自动闭包这些内容,
可以以后用到时再学吧。
let names = ["Chris", "Alex", "Eva", "Barry", "Daniella"]func backward(_ s1: String, _ s2: String) -> Bool { return s1 < s2}var rNames = names.sorted(by: backward)rNames = names.sorted(by: {(s1: String, s2: String) -> Bool in return s1 > s2})rNames = names.sorted(by: {(s1: String, s2: String) -> Bool in return s1 > s2})rNames = names.sorted(by: {s1, s2 in return s1 > s2})rNames = names.sorted(by: {s1, s2 in s1 > s2})rNames = names.sorted(by: {$0 > $1})rNames = names.sorted(by: >)rNames = names.sorted(){$0 > $1}rNames = names.sorted{$0 > $1}print(rNames)let digitNames = [ 0: "Zero", 1: "One", 2: "Two", 3: "Three", 4: "Four", 5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine"]let numbers = [16, 58, 510]let strings = numbers.map { (number) -> String in var number = number var output = "" repeat { output = digitNames[number % 10]! + output number /= 10 } while number > 0 return output}print(strings)func makeIncrementer(forIncrement amount: Int) -> () -> Int { var runningTotal = 0 func incrementer() -> Int { runningTotal += amount return runningTotal } return incrementer}let incrementByTen = makeIncrementer(forIncrement: 10)print(incrementByTen())print(incrementByTen())print(incrementByTen())print(incrementByTen())
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