I also expected the filter+map version to be slower, not because of the extra loop, but because of the intermediate array that needs to be created. But maybe the browser can optimize it away.
I haven't profiled it on that level, so maybe there is a difference in memory usage. I honestly don't know. Browsers have changed quite a bit over the last few years. So I wouldn't be surprised if the intermediate array has been optimized away.
It would be interesting to compare the memory profiles though.
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Both examples are O(n) complexity so they should be almost similar. Only on large example you will see differences
True. I can't believe I missed that. Jacob Paris explains it dead simple in a tweet.
It's time I return to school.
I also expected the filter+map version to be slower, not because of the extra loop, but because of the intermediate array that needs to be created. But maybe the browser can optimize it away.
I haven't profiled it on that level, so maybe there is a difference in memory usage. I honestly don't know. Browsers have changed quite a bit over the last few years. So I wouldn't be surprised if the intermediate array has been optimized away.
It would be interesting to compare the memory profiles though.