11 lines
307 B
Markdown
11 lines
307 B
Markdown
### Deep flatten array
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Use recursion.
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Use `Array.reduce()` to get all elements that are not arrays, flatten each element that is an array.
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```js
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const deepFlatten = arr =>
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arr.reduce( (a, v) => a.concat( Array.isArray(v) ? deepFlatten(v) : v ), []);
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// deepFlatten([1,[2],[[3],4],5]) -> [1,2,3,4,5]
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```
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