How to inherit a class if it is created using a constructor?

Question

There is a code:

<script> function base(x){ this.x = x; } function derived(y){ this.y = y; } </script>

How can I declare a base class as a prototype of the class derived , if they are created using a constructor?

Grundy grundy 58.7k 7 golden marks 54 silver marks 95 bronze marks · Accepted Answer · 2016-04-23T12:04:25

In order to link the two classes you need to set the prototype property

 function Base(x){ this.x = x; } function Derived(y){ this.y = y; } Derived.prototype = Object.create(Base.prototype);

To add inherited properties to the created object, call the base constructor in the heir

 function Derived(x, y){ Base.call(this, x); this.y = y; }

Various approaches to inheritance can be seen in the help.

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