function.prototype.build.js

// From @littlecalculist
// http://twitter.com/#!/littlecalculist/status/89840539494662144

Function.prototype.build = function(a) { 
    return new (
        this.bind.apply(this, [,].concat(a))
    ); 
};

// Example constructor that "does things"
function Ctor( options ) {
    this.whoami = "Ctor";
    this.settings = options;
    return this;
}

var c = Ctor.build( {} );


console.log( c );

/*

Ctor
    settings: {}
    whoami: "Ctor"

*/

function.prototype.construct.js

// From @brendaneich
// http://twitter.com/#!/BrendanEich/status/89823462847291392

Function.prototype.construct = function() {

  return new( 
    this.bind.apply( this, [,].concat( [].slice.call(arguments) ) )
  );
};


function Ctor( options ) {
    this.whoami = "Ctor";
    this.settings = options;
    return this;
}

var c = Ctor.construct( {} );


console.log( c );

/*

Ctor
    settings: {}
    whoami: "Ctor"

*/