Helper method to set the value of 'this'

bind.js

/**
 * Helper method to set the value of 'this'.
 * @param  {Object} thisObject The value of 'this' to be set.
 * @return {Function}            Function whose this is to be set with custom this set.
 */
Function.prototype.bind = function ( thisObject ) {

    var that = this;

    return function () { that.apply( thisObject, arguments ); };
};