12 ms·

the other benefit is that `void 0` cannot be overwritten in sloppy mode, whereas you can do something crazy like this: undefined = 'lol';

• evilpie 12y ago
  No you can't. You can do something like function(undefined) {}, but the global 'undefined' is non-writable and non-configurable.
  • ahoge 12y ago
    That's an ES5 change. With ES3, you can overwrite NaN, Infinity, and undefined.
    • LunaSea 12y ago
      Only in strict mode I though no ?
      • ahoge 12y ago
        Generally. Technically, it's a "breaking change". As you can imagine, this didn't actually affect anyone.