An "implements" function inspired by interfaces in C#, for JavaScript. Interface properties are copied into the receiving object's prototype collection, which become available as instance properties.

Object.prototype.implements.js

/**
 * Extends the Object prototype to provide basic support for interface-like structures and declarations.
 * @param {Object[]} - comma-delimited list of objects with properties to implement.
 * @example
 * // returns Class object with IClass' someFunction property. Instances of Class will have this property defined.
 * var IClass = {someFunction:function(){}};
 * var Class = function(){}.implements(IClass);
 * @returns {Object}
 */
Object.prototype.implements = function() {
  
  var i = arguments.length;
  while (i--) {
    var interface = arguments[i];
    for(var property in interface) {
      if (!!this.prototype && !this.prototype.hasOwnProperty(property)) {
        this.prototype[property] = interface[property];
      }  
    } 
  }  

  return this;
};