How to ‘pop’ or ‘shift’ from jQuery set

They’re missing because a jQuery object isn’t an Array.

(function( $ ) {
    $.fn.pop = function() {
        var top = this.get(-1);
        this.splice(this.length-1,1);
        return top;
    };

    $.fn.shift = function() {
        var bottom = this.get(0);
        this.splice(0,1);
        return bottom;
    };
})( jQuery );

EDIT: .slice() doesn’t modify the original object. Fixed to use .splice() instead.