在对象文字中引用嵌套的'sibling'属性

Question

I want to reference a nested property in an object literal from within another property in that same object literal.

Consider the following contrived example:

var obj = {
   product1: {
      price: 80,
      price_was: 100,
      discount: function(){

        return 100 - (100 * (price/price_was));

        //I don't want to use:  
        //100 - (100 * (this.product1.price/this.product1.price_was))
        //because the name of the parent ('product1' in this case) isn't known 
        //a-priori.

      }
   }
} 

The above is obviously incorrect, but how to get to 'price' and 'price_was' from within 'discount'?

I've looked at the following question, which is close, but in that question the needed property is a direct child of 'this', which in the above example isn't the case. reference variable in object literal?

Any way to do this?

Answer 1

"...in that question the needed property is a direct child of 'this', which in the above example isn't the case"

Actually, it probably is if you're calling .discount() from the productN object.

So you wouldn't use this.product1.price , because if you're calling discount from productN , then this will be a reference to productN .

Just do this:

this.price;
this.price_was;

...so it would look like:

var obj = {
   product1: {
      price: 80,
      price_was: 100,
      discount: function(){

        return 100 - (100 * (this.price/this.price_was));

      }
   }
};

Again, this assumes you're calling the function from the productN object. If not, it would be helpful if you would show how discount is being called.