frankiehayward
12/4/2019 - 9:00 AM

deepFlatten

This snippet flattens an array recursively.

deep_flatten.js
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const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));

deepFlatten([1, [2], [[3], 4], 5]); // [1,2,3,4,5]