How to implement chained method calls like jQuery?

Question

So I am (still) completely in love with the almighty jQuery, and I have my own growing library of utilities that I want to codify in a java-script object. And I would like t

Answer 1

You are almost there:

new foo('hello').alertTest('world');

or if you don't like the new:

var bar = function bar(str) {
    this.str = str;    
};

bar.prototype = {
    alertTest :  function(additional){
        alert(this.str + ' ' + additional);
        return this;
    }
};

function foo(str) {
    return new bar(str);
}

foo('hello').alertTest('world');

Live Demo.