Discussion on: JavaScript/Typescript Tips compilation 2021🚀

[Kingkor Roy Tirtho]

Yeah, I saw the difference. for_of is almost 20%-30% slower than forEach. It makes sense as Array.entries has to take an iteration to map out the index. I wonder why there's no native way of getting the index in for_of without a performance penalty🤔! for_of is so much more readable & mitigates the callback hell at least a little bit

Also I wouldn't really recommend anyone to use + instead of perseInt or parseFloat. Just mentioned as it is also doable too

Thank you so much for your corrections❤️

[James Thomson]

If you wanted an index to reference, but want to use for...of you'd be better off (performance wise) using a variable to track it.

const array1 = ['a', 'b', 'c'];
let i = 0;
for (const element of array1) {
  console.log(element,i);
  i++;
}