搅乱数组中的元素 Shuffling Array Elements

问题 Problem

你想搅乱数组中的元素。

You want to shuffle the elements in an array.

方法 Solution

JavaScript中的Array有一个sort()方法，接受一个自定义的排序函数。我们只需写一个shuffle()函数就行。

The JavaScript Array sort() method accepts a custom sort function. We can write a shuffle() method to add some convenience.

Array::shuffle = -> @sort -> 0.5 - Math.random()

[1..9].shuffle()
# => [ 3, 1, 5, 6, 4, 8, 2, 9, 7 ]

详解 Discussion

更多关于这个混淆函数的工作原理，参看StackOverflow上的讨论。

For more background on how this shuffle logic works, see this discussion at StackOverflow.

注意： 尽管这在常见的语言，比如说Ruby中很常见，但是在JavaScript中扩展原生对象往往被成是不好的实践。(参看： Maintainable JavaScript: Don’t modify objects you don’t own; Extending built-in native objects. Evil or not?)。

Note: Although it’s quite common in languages like Ruby, extending native objects is often considered bad practice in JavaScript (see: Maintainable JavaScript: Don’t modify objects you don’t own; Extending built-in native objects. Evil or not?).