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ObjectBoilerPlateModule - some methods to assist creating objects

/ Published in: JavaScript
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# addMethod - By John Resig (MIT Licensed)
Add a method to an object. Creates function overloading scenario based entirely on length of argument list. Won't work to overload functions according to argument "type".

# inherit
Create parameter-less inheritance chain for situations in which the parent object takes arguments in its "constructor".

Usage:

function A(a, b) { }
function B() { A.call(this, 1, 2); }
B.prototype = inherit(A.prototype);

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  1. /*jslint plusplus: true, vars: true, browser: true, devel: false, maxerr: 5, maxlen: 140 */
  2. function ObjectBoilerPlateModule() {
  3.     "use strict";
  4.  
  5.     // addMethod - By John Resig (MIT Licensed)
  6.     // add a method to an object.
  7.     // creates function overloading scenario based entirely on length of argument list.
  8.     // won't work to overload functions according to argument "type".
  9.     function addMethod(object, name, fn) {
  10.         var old = object[name];
  11.         object[name] = function () {
  12.             if (fn.length === arguments.length) {
  13.                 return fn.apply(this, arguments);
  14.             }
  15.  
  16.             if (typeof old === 'function') {
  17.                 return old.apply(this, arguments);
  18.             }
  19.  
  20.             throw "Invalid";
  21.         };
  22.     }
  23.  
  24.     function inherit(parentPrototype) {
  25.         function F() {}
  26.         F.prototype = parentPrototype;
  27.         return new F();
  28.     }
  29.  
  30.  
  31.     this.addMethod = addMethod;
  32.     this.inherit = inherit;
  33. }

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