1 min readJul 19, 2019
In terms of terse syntax, it’s true that this could be written in one line which is cool sometimes. In this case, however, you’re combining a spread with a .map(). This is actually exponentially detrimental to performance. For 10 items it’s like 2x as long, 100 it’s 8.5x, 1000 it’s about 36x.
Most of the time you deal with small data sets where the performance difference is probably negligible, but in this case you also have code which is not nearly as easy to read as a simple .reduce().
So as a result, you get a one-liner that is exponentially slower, and harder to read/maintain.
