Swift 笔记（九）

概述我的主力博客：半亩方塘 Randomizing an array The function below returns a random number between 0 and the given argument: import Foundationfunc randomFromZeroTo(number: Int) -> Int { return Int(arc4random_un

我的主力博客：半亩方塘

Randomizing an array

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The function below returns a random number between 0 and the given argument:

import Foundationfunc randomFromZeroTo(number: Int) -> Int {    return Int(arc4random_uniform(UInt32(number)))}

Use it to write a function that shuffles the elements of an array in random order. This is the signature of the function:

func randomArray(array: [Int]) -> [Int]

The answer is below:

func randomArray(array: [Int]) -> [Int] {    var newArray = array    for index in 0..<array.count {        let randomIndex = randomFromZeroTo(array.count)        let value = newArray[index]        newArray[index] = newArray[randomIndex]        newArray[randomIndex] = value    }    return newArray}

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