native js vs underscore

Bind and call compared

function Developer(skill) {
this.skill = skill;
this.says = function(){
alert(this.skill + ' rocks!');
}
}
 
var john = new Developer('Backbone');
var func = john.says;
func.apply(john);
 
var john = new Developer('Backbone');
var func = _.bind(john.says, john);
func();
 
var john = new Developer('Backbone');
_.bindAll(john, 'says');
var func = john.says;
func();