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Improve code for initializing array from a function #649

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Array.from() is, in my opinion at least, clearer in meaning than the spread operator with Array.prototype.map(). Also, as it does not create an intermediate array, it appears to be around twice as fast (on firefox).

`Array.from()` is, in my opinion at least, clearer in meaning than the spread operator with `Array.prototype.map()`. Also, as it does not create an intermediate array, it appears to be [around twice as fast](https://jsben.ch/phmxK) (on firefox).
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