iOS swift-开发笔记2

//*****//数组获取偶数值

let numbers = [1, 2, 3, 4, 5, 6]

let evens = numbers.filter{$0 % 2 == 0}

print(evens)

//打印结果

[2, 4, 6]

//*****//判断数组序列是否包含元素

["1","6","4"].contains("2") == false

//*****//剔除数组最后一个元素

["a","b"].dropLast() == ["a"]

//*****//剔除数组第一个元素

["a","b"].dropFirst() == ["b"]

//*****//判断数组序列是否相同

["a","b"].elementsEqual(["b","a"]) == false

//*****//获取index(indices是index的复数)

["a","b"].indices == 0..<2

//*****//将序列以分隔符串联起来成为字符串

["A", "B", "C"].joined(separator: ":") == "A:B:C"

//*****//逆序,注意返回的并非原类型序列

Array([2, 7, 0].reversed()) == [0, 7, 2]