Protected protocol

gistfile1.js

"use strict";

Function.prototype.curry = function(){
    var bindArgs = [undefined].concat(Array.prototype.slice.call(arguments, 0));
    console.log('bindArgs', bindArgs);
    return Function.prototype.bind.apply(this, bindArgs);
}

function makeProtectedStore(){
    var wm = new WeakMap();
    
    return function(o){
        console.log('typeof o', typeof o);
    
        var p = wm.get(o);
        
        if(!p){
            p = {};
            wm.set(o, p);
        }
        
        return p;
    };
}

// add a cache? so that makeConstructorWithProtected(C) === makeConstructorWithProtected(C)?
function makeConstructorWithProtected(C){

    var prot = makeProtectedStore();

    var boundC = C.curry(prot);

    Object.defineProperty(boundC, 'originalConstructor', {
        value: C
    });
    
    Object.defineProperty(boundC, 'prototype', {
        configurable: false,
        get: function(){return C.prototype;},
        set: function(v){C.prototype = v;}
    });
    
    return boundC;
}


function inherit(constr, parent){
    var prot = makeProtectedStore();
    var boundParent = function(){
        return parent.originalConstructor.apply(this, [prot].concat(Array.prototype.slice.call(arguments, 0)))
    };
    return constr.curry(prot, boundParent);
}





// PERSON
(function(global){

    function Person(Protected, name){
        console.log('this in Person', this);
        Protected(this).secret = String(Math.random()).substr(2);
        console.info("person's secret", Protected(this).secret, "...shhhhhhh!!!...");
        this.name = name;
    }

    global.Person = makeConstructorWithProtected(Person);
  
})(this);


// COMPUTER SAVVY PERSON
(function(global){

    function ComputerSavvyPerson(Protected, Super, name, favoriteLanguage){
        console.log('this in ComputerSavvyPerson', this);
        Super.call(this, name);
        this.favoriteLanguage = favoriteLanguage;
        this.getSecretFirstLetter = function(){
            return Protected(this).secret[0];
        }
    }

    global.ComputerSavvyPerson = inherit(ComputerSavvyPerson, Person);
  
})(this);


// CLIENT CODE
var d = new Person('David');
console.log('d.name:', d.name);
console.log(d);

var db = new ComputerSavvyPerson('David Bruant', 'JavaScript');
console.log('db.name:', db.name);
console.log('db.favoriteLanguage:', db.favoriteLanguage);
console.log('first letter secret', db.getSecretFirstLetter());