Object-Oriented JavaScript - Third Edition

Chapter 6, Inheritance

Lets solve the following exercise:

Exercises

1. Multiple inheritance by mixing into the prototype, for example:

           var my = objectMulti(obj, another_obj, a_third, { 
             additional: "properties" 
           }); 
           A possible solution: 
           function objectMulti() { 
             var Constr, i, prop, mixme; 
    
           // constructor that sets own properties 
           var Constr = function (props) { 
             for (var prop in props) { 
               this[prop] = props[prop]; 
             } 
           }; 
    
          // mix into the prototype 
          for (var i = 0; i < arguments.length - 1; i++) { 
            var mixme = arguments[i]; 
            for (var prop in mixme) { 
              Constr.prototype[prop] = mixme[prop]; 
            } 
          } 
    
         return new Constr(arguments[arguments.length - 1]);
      } 
   

   Testing:

    > var obj_a = {a: 1}; > var obj_b = {a: 2, b: 2}; > var obj_c = {c: 3}; > var my = objectMulti(obj_a, obj_b, ...