vararray: Array<Int> = [3,6,1,7,2,4,9,5,8]// 从大到小对数组排序func xx(num1: Int, num2: Int)->Bool {returnnum1 >num2 } array.sort(by: xx) array// {9, 8, 7, 6, 5, 4, 3, 2, 1} array.sort(by: {(num1: Int, num2: Int)-> Boolinreturnnum1 >num2 }) ar...
arr.sort(by: { (i1: Int, i2: Int) -> Bool in return i1 > i2 }) arr.sort(by: { i1, i2 in return i1 > i2 }) arr.sort(by: { i1, i2 in i1 > i2 }) arr.sort(by: { $0 > $1 }) arr.sort(by: >) arr.sort() { $0 > $1 } arr.sort { $0 > $1 } /...
let arr = ["hello","world","guohai"]///闭包表达式当做参数//写法一let sortArr0 = arr.sorted{(str1: String, str2: String) -> Boolinreturnstr1 <str2 }//写法二: 省去了参数类型let sortArr1 = arr.sorted{(str1, str2) -> Boolinreturnstr1 <str2 }//写法三: 如果返回值是单一表达...
(>)的字符串实现,其作为一个函数接受两个Int类型的参数并返回Bool类型的值。...可以使用大于号来代替闭包 sortInts = someInts.sorted(by: >) print(sortInts) 2.6.尾随闭包,解决长闭包的书写问题如果你需要将一个很长的闭包表达式作为最后一个参数传递给函数...} 总结Swift闭包主要的四种优化方法: 1.利用...
in return n1<n2} 利用上下文推断参数和返回值类型推断参数 array.sort(by:{(n1,n2)-> Bool in return n1 < n2}) 推断返回 array.sort...总之就断了 array.sort(by : < ) 闭包引用类型 func coding(day: Int ...
func quickSort<C : MutableCollection where C.IndexType : SignedInteger> (inout elements: C, range: Range<C.IndexType>, less: (C.GeneratorType.Element, C.GeneratorType.Element) -> Bool)func reduce<S : Sequence, U>(sequence: S, initial: U, combine: (U, S.GeneratorType.Element) -...
func insertSort<T : Comparable> (_ array : [T], _ compare:(T,T) -> Bool ) -> [T]{ var tempArray = array for var i in 1..<tempArray.count { while i > 0 && compare(tempArray[i], tempArray[i - 1]) { tempArray.swapAt(i, i - 1) ...
Swift 的String类型定义了关于大于号 (>) 的字符串实现,其作为一个函数接受两个String类型的参数并返回Bool类型的值。 而这正好与sort(_:)方法的第二个参数需要的函数类型相符合。 因此,您可以简单地传递一个大于号,Swift可以自动推断出您想使用大于号的字符串函数实现: ...
Be aware that, in Swift 3.0, some common Swift and Objective-C struct types will bridge as opaque objects instead of as idiomatic Cocoa objects. For instance, whereasInt,UInt,Double, andBoolbridge toNSNumber, the other sized numeric types such asInt8,UInt16, etc. only bridge as opaque obje...
autoReconnect (Bool) - set whether or not you'd like the library to try and automatically reconnect upon disconnection (where possible). See Reconnection for more info host (PusherHost) - set a custom value for the host you'd like to connect to, e.g. PusherHost.host("ws-test.pusher....