Discussion on: JavaScript/Typescript Tips compilation 2021🚀

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Replies for: 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 i...

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++;
}