Iterative jQuery methods that use a single jQuery object for context to simplify usage

gistfile1.js

(function($){

    $.fn.$each = function(callback) {
        var $temp = $([1]);
        return this.each(function() {
            $temp[0] = this;
            return callback.apply($temp, arguments);
        });
    };

    $.fn.$filter = function(callback, invert) {
        var $temp = $([1]);
        return this.filter(function() {
            $temp[0] = this;
            return callback.apply($temp, arguments);
        }, invert);
    };

    $.fn.$map = function(callback) {
        var $temp = $([1]);
        return this.map(function() {
            $temp[0] = this;
            return callback.apply($temp, arguments);
        });
    };


    $.fn.some = $.fn.is;

    $.fn.$some = $.fn.$is = function() {
        return this.$filter.apply(this, arguments).length > 0;
    };

    $.fn.every = function() {
        return this.length === this.filter.apply(this, arguments).length;
    };

    $.fn.$every = function() {
        return this.length === this.$filter.apply(this, arguments).length;
    };

}(jQuery));