Array.Map vs For...loop

I was solving a problem and saw when I used Array.map the execution was lagging a bit. And thought to switch to using for...loop, as I was not doing any complicated calculation within map callback.

This is the sample benchmark data I used

6,1,4,5,3,9,0,1,9,5,1,8,6,7,0,5,5,4,4

And I did not do anything fancy, just pushed it to an array, similar to map where is returns us a new array.

Compared it using JS Perf and saw that for..loop is ~25 times faster than map.

I would not be switching to for..loop because of this, a good to know when there is a slow down in the application.

Comments

[Nevo David]

Pretty cool seeing you actually testing stuff in real code. Makes me wanna check if half the stuff I use daily is slower than I think.

[Nathan Tarbert]

Yeah, knowing both tricks helps a ton. I always reach for what keeps my brain happy unless the speed drop is unbearable.