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Update sampleSize.md

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Angelos Chalaris
2017-12-31 14:09:45 +02:00
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snippets/sampleSize.md
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@ -2,8 +2,12 @@
Gets `n` random elements at unique keys from `array` up to the size of `array`. Gets `n` random elements at unique keys from `array` up to the size of `array`.
Shuffle the array using the [Fisher-Yates algorithm](https://github.com/chalarangelo/30-seconds-of-code#shuffle).
Use `Array.slice()` to get the first `n` elements.
Omit the second arguent, `n` to get only one element at random from the array.
```js ```js
const sampleSize = (arr,n=1) => { const sampleSize = ([...arr],n=1) => {
let m = arr.length; let m = arr.length;
while (m) { while (m) {
const i = Math.floor(Math.random() * m--); const i = Math.floor(Math.random() * m--);