Javascript: How to use variable in sort function?

Question

How can I sort the items by price? It wont work if I run like this sortData('price'), it will work only if I change obj1.type to obj1.price, but I dont want to write duplicate function just because of the key.

   function sortData(type) {
        var items = [{id:3,price:40}, {id:5,price:100}, {id:1,price:1}];
        items.sort(function(obj1,obj2) {
            return obj1.type - obj2.type;   
        })
    }

Answer 1

Check this solution, i hope it will help you :D

function sortData(type) {
        var items = [{id:3,price:40}, {id:5,price:100}, {id:1,price:1}];
        items.sort(function(obj1,obj2) {
            return (obj1[type] - obj2[type]);   
        })
        console.log(items)
    }
  sortData('price');

Answer 2

You could take a function which returns a function for the callback by using a closure over the key.

function sortBy(key) {
    return function (a, b) {
        return a[key] - b[key];
    };
}

var items = [{ id: 3, price: 40 }, { id: 5, price: 100 }, { id: 1, price: 1 }];

items.sort(sortBy('price'));
console.log(items);

items.sort(sortBy('id'));
console.log(items);

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