Use less self and bind instead

Instead of

var self = this;
doSomeStuffAsync(function(result){
  self.processThe(result);
});

use

doSomeStuffAsync(function(result){
  this.processThe(result);
}.bind(this));

(Only if the this object of the callback is not needed.)

(from redmine: issue id 2355, created on 2016-05-10 by benjamin.fischer)