But Swift for loops also allow us to use pattern matching. Instead of using an if statement inside the body, we can add awhereclause to the loop, specifying anyboolean conditionto filter the elements of a sequence. fornumberin1...10wherenumber.isMultiple(of:2){print(number)}// 2// 4...
问理解Swift 3中的for循环时遇到问题EN前言 任何语言中最常用的就是for循环了 但是Swift的for循环语法...
Swift for 循环 Swift 循环 该循环方式在 Swift 3 中已经弃用。 Swift for 循环用来重复执行一系列语句直到达成特定条件,一般通过在每次循环完成后增加计数器的值来实现。 语法 Swift for 循环的语法格式如下: forinit;condition;increment{循环体} 参数解析: init会首先被执行,且只会执行一次。这一步允许您声明并...
In Swift, we can useforloop to iterate over a range. For example, // iterate from i = 1 to i = 3foriin1...3{print(i) } Output 1 2 3 In the above example, we have used thefor-inloop to iterate over a range from1to3. ...
(Swift for loop) To iterate over a sequence without using subscripts (indexes) we usefor loopas shown below. 要遍历序列而不使用下标(索引),我们使用for loop,如下所示。 var numberArray = [2,4,6,8,10] for number in numberArray {
Text("2个一组:\(self.nlist.chunked(into:2).description)") } } } extensionArray{ funcchunked(into size: Int)-> [[Element]] { returnstride(from:0, to:count, by: size).map{ Array(self[$0..<Swift.min($0+ size,count)]) } } } 剩余50%的内容订阅专栏后可查看...
变量名需要以字母或下划线开始。 Swift 是一个区分大小写的语言，所以字母大写与小写是不一样的。
var i:Int = 1 var sum:Int = 0 while i < 10 { sum = sum + i //it’s like we did 1+2+3+4+5+6+7+8+9! i+=1 } print(sum) //prints 45 Based on this example we can clearly see the usefulness of using the while loop in Swift. Swift Repeat – While Loops Similar ...
Terminal运行swift forLoop.swift如下: for i in 1..<5 runs 4 times 1 2 3 4 for i in 1...5 runs 5 times 1 2 3 4 5 for _ in 1...2 runs 2 times and only care loop count but not the index in loop printing _ here, it means nothing but loop, you can't use as \(_) ...
Prefer the for-in style of for loop over the while-condition-increment style.Preferred:for _ in 0..<3 { print("Hello three times") } for (index, person) in attendeeList.enumerated() { print("\(person) is at position #\(index)") } for index in stride(from: 0, to: items.count...