Day5-Day 9:Loop,Closure

Loop

for-in

//1-5
for i in 1...5 {}

//1-4
for i in 1..<5{}

while

//随机数
let i = Int.random(in: 1...1000)
let d = Double.random(in: 0...1)

Closure

sort,map,filter等常用函数的进阶用法

sort(by: { (name1:String, name2 : String) -> Bool in
//自定义判断
return name1 < name2
})

sort(by:{name1,name2 in 
})

sort{name1,name2 in
}

sort{
return $0 > $1
}

sort{ $0 > $1 }

closure 当做参数传递

func someFunc(size : Int ,using someBlock: () -> Int) -> [Int]{
var numbers = [Int]()
for _ in 0..< size{
	let num = someBlock()
	numbers.append(num)
}
return numbers
}

let getRandom = someFunc(size : 10){
	Int.random(in : 1...100)
}