Creates a function that executes with the given context and pushes the original context to the first argument of the function.

unshiftContext.js

// Creates a function that executes with the given context and pushes the original context to the first argument of the function.
unshiftContext: function(func, thisArg) {
    return function() {
        var args = Array.prototype.slice.call(arguments);
        args.unshift(this);
        func.apply(thisArg, args);
    };
},