Is the Javascript String length constant time?

Question

I\'m fairly new to JS, and realize length is considered a property. But I received a comment to not use str.length in a loop:

for (i=0; i

Answer 1

Strings are also immutable in JavaScript. The length property does not need to be computed each time it is accessed.

I created a jsperf benchmark for you to view here.

You'll notice the speeds are the same.