flatmap javascript

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1var arr = [1, 2, 3, 4];
2
3arr.flatMap(x => [x, x * 2]);
4// is equivalent to
5arr.reduce((acc, x) => acc.concat([x, x * 2]), []);
6// [1, 2, 2, 4, 3, 6, 4, 8]
7

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