Prototype copy vs Object.create() vs new

Question

I was using inheritance and I noticed that there are three ways to get the same result. What\'s the difference?

function Animal(){
}

Animal.prototype.doThat         


        

Answer 1

You could either use Solution 1 or Solution 2, but you should not use Solution 3.

The reason is when you do Bird.prototype = Animal.prototype;, every change on Bird.prototype will also affect Animal.prototype, because they the same object.

For example, you attach a method on Bird.prototype, then the method will also works on Animal, which will not be what you want.