gistfile1.js

// The `quickEach` method will pass a non-unique jQuery instance
// to the callback meaning that there will be no need to instantiate
// a fresh jQuery instance on each iteration. Most of the slow-down
// inherent in jQuery's native iterator method (`each`) is the constant
// need to have access to jQuery's methods, and so most developers
// see constructing multiple instances as no issue... E.g.
//     $(...).each(function(){ $(this)... $(this)... $(this)... });
// A better approach would be `quickEach`.

jQuery.fn.quickEach = (function(){
    
    var jq = jQuery([1]);
    
    return function(c) {

        var i = -1, el, len = this.length;
        
        try {
            
            while (
                 ++i < len &&
                 (el = jq[0] = this[i]) &&
                 c.call(jq, i, el) !== false
            );
            
        } catch(e){

            delete jq[0];
            throw e;
 
        }

        delete jq[0];

        return this;
    
    };
    
}());

// E.g.

jQuery('div').quickEach(function(i){
    // `this` is a jQuery object
    this.attr('id', 'd' + i).css('color', 'red'); // etc.
});