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snippets/js/s/chunk-into-n.md

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+---
+title: Split array into n chunks
+type: snippet
+language: javascript
+tags: [array]
+author: chalarangelo
+cover: dark-leaves-2
+dateModified: 2020-11-03T21:46:13+02:00
+---
+
+Chunks an array into `n` smaller arrays.
+
+- Use `Math.ceil()` and `Array.prototype.length` to get the size of each chunk.
+- Use `Array.from()` to create a new array of size `n`.
+- Use `Array.prototype.slice()` 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
+const chunkIntoN = (arr, n) => {
+  const size = Math.ceil(arr.length / n);
+  return Array.from({ length: n }, (v, i) =>
+    arr.slice(i * size, i * size + size)
+  );
+}
+```
+
+```js
+chunkIntoN([1, 2, 3, 4, 5, 6, 7], 4); // [[1, 2], [3, 4], [5, 6], [7]]
+```