1049495 - Autocomplete hangs on large arrays even though indices can't be autocompleted anyway

Status: RESOLVED DUPLICATE of bug 998344

(DevTools :: Console, defect)

Description

[:Gijs (he/him)]

In the browser console, run:

let myAry = (function(values) {
  var iterator;

  iterator = 0;

  for (; iterator < 12582912; iterator += 1) {
    values[iterator] = iterator;
  }

  return values;
})([]); null;


Then type in:

myAry.

and watch the beachballing/hanging.

Can we make this behave better? :-)

Note that replacing the values[iterator] = iterator; line with a .push() equivalent doesn't help, so I don't *think* this has to do with expando properties or something of that sort - maybe we can make the autocomplete code more clever and detect arrays with Array.isArray ? Although I guess we'd still need to have a clever way to find expandos set on the array while ignoring the numeric indices which I can't talk to by starting off with "myAry." anyway...

Don't know if this is super-fixable, but I figured it'd be worth filing either way.