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Avoid Using New Array() in JavaScript

https://www.yogeshchauhan.com/304/javascript/avoid-using-new-array-in-javascript

by yogiUSA • 6 years ago

4 3 6 years ago

YO

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3

akully• 6 years ago

I first heard this from Doug Crockford, a senior architect for Javascript

+1 for the corroboration

yogiUSA• 6 years ago

Thank you!

I was going through the differences and it started acting weirdly so I thought let's share this.

DXA9zE• 6 years ago

There is nothing wrong with using new Array() to construct array of known capacity. By default, I think JS literal arrays will have a capacity of 4, so especially if you know you will have less than four elements, or a non power of two number of elements, this can be seen as a micro-optimization. `bluebird` uses new Array() extensively, e.g.

https://github.com/petkaantonov/bluebird/blob/12154adb501660...

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