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