javascript inheritFrom Vs Prototype

Question

I am wondering whats the difference between inheritFrom and the prototype when defining inheritance in Javascript.

function classA{}
classA.name="abc";
classA.functionName=function(){
alert("Function Name Alert");
}
function classB{ }

Whats the difference in the below codes?

classB.prototype=classA();

and

classB.prototype.inheritFrom(classA);

Searching for inhertFrom, I've found this: java2s.com/Tutorial/JavaScript/0500__Object-Oriented/… — kzh
– kzh, Commented Sep 10, 2011 at 17:39

kzh · Accepted Answer · 2011-09-10 18:58:45Z

6

B.prototype.inheritFrom(A) is not standard JavaScript, whereas B.prototype = new A is standard JavaScript. I suggest learning the ins and outs of JavaScript and embracing the prototype. You'll be better off for knowing it. It's really not too difficult:

function A(){}
function B(){}
B.prototype = new A;
b = new B;
console.log(b instanceof B, b instanceof A);
//-> true, true

edited Sep 10, 2011 at 18:58

answered Sep 10, 2011 at 17:44

kzh

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