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30-seconds-of-code/snippets/flatten-array.md
2017-12-07 12:00:34 +02:00

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### Flatten array
Use recursion.
Use `reduce()` to get all elements that are not arrays, flatten each element that is an array.
```js
var flatten = arr =>
arr.reduce( (a, v) => a.concat( Array.isArray(v) ? flatten(v) : v ), []);
```