Proper for each loops for JS dicts.

gistfile1.txt

// BAD
for (var key in this._workingPeers) {
  var peer = this._workingPeers[key];
}

// GOOD
var indices = Object.keys(this._workingPeers);
for (var i = 0; i < indices.length; i++) {
  var peer = this._workingPeers[indices[i]];
}

/*
Reasons:
- For in looks up prototype chain and is slow
- For in requires you to use .hasOwnProperty or it will report properties up the prototype chain
*/