[removed] Is the length method efficient?

Question

i\'m doing some javascript coding and I was wondering if the length method is \"precomputed\", or remembered by the JS engine.

So, the question is:

If I\'m c

Answer 1

For any collection-type object whose length you will not be manipulating (e.g. any immutable collection), it's always a good idea to cache its length for better performance.

var elems = document.getElementsByName("tst");
var elemsLen = elems.length;
var i;
for(i = 0; i < elemsLen; ++i)
{
  // work with elems... example:
  // elems[i].selected = false;
}
elems = [10,20,30,40,50,60,70,80,90,100];
elemsLen = elems.length;
for(i = 0; i < elemsLen; ++i)
{
  // work with elems... example:
  // elems[i] = elems[i] / 10;
}