Are there several performance penalties for using Objects with functions and mixins, rather than prototypes? [closed]

Answer 1

If you're worried about this you could mix in on the prototype but as Bergi says; when calling a method many times it actually has a shorter look up if you have the method on the instance instead of on it's prototype.

Here is how to mixin on the prototype:

function mixin(source, target){
  for(thing in source){
    if(source.hasOwnProperty(thing)){
      target[thing]=source[thing];
    }
  }
};
var canSpeak = function(){
  //initialize instance specific values
  this.canSpeakMessage="Hello World";
  this.someArrayThatNeedsToBeInitialized=[];
};
canSpeak.prototype.speak = function(){
  console.log(this.canSpeakMessage);
}
var Test= function(){
  //init instance specific values for canSpeak
  canSpeak.apply(this,arguments);
};
mixin(canSpeak.prototype,Test.prototype);


var t = new Test();
t.speak();//=Hello World