Array

介绍一下Array的几个方法

lexicographicallyPrecedes -> Bool
let a = [1,2,3]
let b = [1,2,3,1]
a.lexicographicallyPrecedes(b) // true  1.2.3 < 1.2.3.1

partition -> Int
var fibonacci = [1, 1, 0, 2, 3, 5]
let privot = fibonacci.partition(by: { $0 < 1 })
// 利用条件排序后切割数组 获取满足的一部分
fibonacci[0 ..< privot] // [1,1,2,3,5]
fibonacci[privot ..< fibonacci.endIndex] //[0]

        let m = ["A", "N"]
        let c = ["a", "n"]
        let dd = m.flatMap { (element) -> [String] in
            c.map { element + $0 }
        }
        print(dd)

//  ["Aa", "An", "Na", "Nn"]