That *could* repeat an array, but it's not very good as a polyfill (it
creates too many intermediate arrays). I'd expect a polyfill would be
closer to this:
```js
const ToInteger = x => (x = +x; x - x % 1)
Array.prototype.repeat = function repeat(count) {
count = ToInteger(count)
let o = Object(this)
let length = ToInteger(o.length)
let output = new Array(length * count)
let i = 0
while (i < count) {
let j = 0
while (j < length) output[i++] = o[j++]
}
return output
}
```
And while we're at it, could we also add a `Array.prototype.set` to
mirror `TypedArray.prototype.set`? I could've used that several times
already, and it's an easily vectorized operation.
-----
Isiah Meadows
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On Sun, Mar 25, 2018 at 2:36 PM, Peter Jaszkowiak <[email protected]> wrote:
> I'm guessing this would be an appropriate polyfill:
>
> ```
> Array.prototype.repeat = function repeat(count) {
> let output = this;
> while (--count) {
> output = output.concat(this);
> }
> return output;
> };
> ```
>
> On Sun, Mar 25, 2018 at 12:27 PM, Cyril Auburtin <[email protected]>
> wrote:
>>
>> String and Array share a few methods.
>>
>> I think `repeat` could exist for Array as well
>>
>> At the moment are other more verbose ways to do so:
>>
>> - `Array.from({length: n}, () => 'foo')`
>> - `Array(n).fill('foo')`
>> - `[].concat(...Array.from({length: 3}, () => ['x', 'y']))`
>> - `[].concat(...Array(3).fill(['x', 'y']))`
>>
>> so with repeat it would just be;
>>
>> - `['foo'].repeat(n)`
>> - `['x', 'y'].repeat(3)`
>>
>> _______________________________________________
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>> https://mail.mozilla.org/listinfo/es-discuss
>>
>
>
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