10 lines
239 B
Markdown
10 lines
239 B
Markdown
### Flatten array
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Use recursion.
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Use `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 flatten = arr =>
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arr.reduce( (a, v) => a.concat( Array.isArray(v) ? flatten(v) : v ), []);
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```
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