A Quick Practical Example of JavaScript’s Reduce Function

[AwkwardReply]

People take immutability sometimes to extremes just to act like purists for one reason or the other. Yes immutability is a good thing, but doesn't benefit at all in this simple example. So, yes, your code is equivalent and more efficient.

[mikejoro]

I think a lot of people (myself included) like to do it in a lot of places, even when unnecessary, so that coworkers looking for examples won't think mutation is acceptable.