JavaScript Best Practices by John Au-Yeung

Author:John Au-Yeung [Au-Yeung, John]
Language: eng
Format: azw3
Published: 2020-07-15T16:00:00+00:00

Optimize Loops

We should cache values that are used in every literation in a single variable.

This is because every time we do this, the CPU has to access the item in memory again and again to compute its results.

Therefore, we should do this as little as possible.

For example, if we have a loop, we shouldn’t write the following:

for (let i = 0; i < arr.length; i++) { }

Instead, we should write:

let length = arr.length; for (let i = 0; i < length; i++) { }

This way, arr.length is only referenced once in our loop instead of accessing it in every iteration.

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