4 ms·
What I don't get about Left-Pad, shouldn't they have used Arrays.join for better perormance?
by facepalm 11y ago
What I don't get about Left-Pad, shouldn't they have used Arrays.join for better perormance?
- richmarr 11y agoArray performance isn't always better than string concatenation. In this test case it comes out slower: https://jsperf.com/left-pad-arrays/3 https://jsperf.com/left-pad-arrays/3 But ultimately it doesn't matter in the least for 99.9% of use cases: https://blog.codinghorror.com/the-sad-tragedy-of-micro-optimization-theater/ https://blog.codinghorror.com/the-sad-tragedy-of-micro-optim...
- facepalm 11y agoInteresting - well I thought if it is being used by thousands of libraries it might be worth optimizing. I just tried in NodeJS, you could also just instantiate an Array of a given length and join it with spaces, like this. var x = new Array(5);x[4] = "abc";x.join(" "); No idea if it could be faster - but the test you linked to pushes spaces into the Array.