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jasperblues/flatten nested arrays in typescript

Created December 11, 2018 11:32
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flatten nested arrays in typescript
const flatten = arr => arr.reduce(
(a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), []
);
flatten([[1, 2, [3]], 4]);
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If the array arrays are not nested we can just use the spread operator:

const result = [].concat(...[[1,2], [3,4]])

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