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this post was submitted on 14 Feb 2026
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There are several legit reasons why you'd do this. Unit tests, for example: override getRandom() with an implementation that always returns the same series of numbers, and now you have repeatable tests without touching the production code.
Can you override Math.random within a local scope?
At my shop we do create generic covers for vendor specific functionality, for the reasons you stated. Though the practice was started in case we ever needed to swap vendors.
You can, but you shouldn’t. You don’t know what else relies on Math.random. That’s why there’s the wrapper function. That you can override in unit tests without worrying about other, unrelated code.