Question

I am trying to do some inheritance in JavaScript

etc

var operation = 
{
   A: 1,
   B: 2,
   C: 3
};

var operationImplA = 
{
   D: 4
};

var operationImplB = 
{
   D: function (event) {
         //do something
      }
};

Something similar to the above but not sure how to do this in JavaScript.

Answer 1

You can simply use Object.create:

var operation = 
{
   A: 1,
   B: 2,
   C: 3
};

var operationImplA = Object.create(operation, {
    D: {
       value: 4
    }
});

var operationImplB = Object.create(operationImplA, {
    D: {
        value: 5
    }
});

Object.create will create new object with prototype it’s first argument and properties defined in the second argument.

This is the natural prototype-based inheritance in JavaScript.

Edit

If you want to add a method, add it like a property i.e.:

var operationImplA = Object.create(operation, {
    M: {
        value: function (a) {
            console.log(a);
        }
    }
});
operationImplA.M('Some text...'); //'Some text...'