在JavaScript中多次重复多个元素的数组

问题描述：

在JavaScript中，如何以简洁的方式重复包含多个元素的数组？

In JavaScript, how can I repeat an array which contains multiple elements, in a concise manner?

在Ruby中，你可以做到

In Ruby, you could do

irb(main):001:0> ["a", "b", "c"] * 3
=> ["a", "b", "c", "a", "b", "c", "a", "b", "c"]

我查了一下lodash库，但找不到任何直接适用的东西。功能请求：重复数组。是将其添加到lodash的功能请求，并且是最好的给出的解决方法

I looked up the lodash library, and didn't find anything that was directly applicable. Feature request: repeat arrays. is a feature request for adding it to lodash, and the best workaround given there is

const arrayToRepeat = [1, 2, 3];
const numberOfRepeats = 3;
const repeatedArray = _.flatten(_.times(numberOfRepeats, _.constant(arrayToRepeat)));

问题最有效的方法来创建一个零填充的JavaScript数组？和创建一个多次重复相同元素的数组专注于多次重复单个元素，而我想重复一次具有多个元素的数组。

The questions Most efficient way to create a zero filled JavaScript array? and Create an array with same element repeated multiple times focus on repeating just a single element multiple times, whereas I want to repeat an array which has multiple elements.

使用维护合理的库是可以接受的。

Using reasonably well-maintained libraries is acceptable.

答

不需要任何库，你可以使用 Array.from 创建一个你想重复的数组数组，然后使用展平[] .concat 和点差：

No need for any library, you can use Array.from to create an array of arrays you want repeated, and then flatten using [].concat and spread:

const makeRepeated = (arr, repeats) =>
  [].concat(...Array.from({ length: repeats }, () => arr));
  
console.log(makeRepeated([1, 2, 3], 2));

在较新的浏览器上，您可以使用 Array.prototype.flat 而不是 [] .concat（... ：

On newer browsers, you can use Array.prototype.flat instead of [].concat(...:

const makeRepeated = (arr, repeats) =>
  Array.from({ length: repeats }, () => arr).flat();
  
console.log(makeRepeated([1, 2, 3], 2));

在JavaScript中多次重复多个元素的数组

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