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Update chunk-array.md

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Angelos Chalaris
2017-12-13 12:04:30 +02:00
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snippets/chunk-array.md
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### Chunk Array ### Chunk Array
Creates an array of elements split into groups the length of size. Use `Array.apply()` to create a new array, that fits the number of chunks that will be produced.
If array can't be split evenly, the final chunk will be the remaining elements. Use `Array.map()` to map each element of the new array to a chunk the length of `size`.
If the original array can't be split evenly, the final chunk will contain the remaining elements.
```js ```js
const chunk = (arr, size) => const chunk = (arr, size) =>
Array Array.apply(null, {length: Math.ceil(arr.length/size)}).map((v, i) => arr.slice(i*size, i*size+size));
.apply(null, {length: Math.ceil(arr.length/size) })
.map((value, index) => arr.slice(index*size, index*size+size) )
// const myArray = [2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 2]; // const myArray = [2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 3, 2, 2];
// chunk(myArray, 3) -> [ [ 2, 2, 2 ], [ 2, 2, 2 ], [ 3, 2, 3 ], [ 2, 3, 2 ], [ 2 ] ] // chunk(myArray, 3) -> [ [ 2, 2, 2 ], [ 2, 2, 2 ], [ 3, 2, 3 ], [ 2, 3, 2 ], [ 2 ] ]
``` ```