Performing math operations on arrays of objects javascript

Question

Performing math operations on arrays of objects javascript

Creating an eCommerce/financial based application with node I am having trouble working out how to have a base figure in a static var var budget = 300; and then have the expenses stored in objects in an array

var expenses = [
   {name: "thingy1", price: "40"},
   {name: "thingy2", price: "30"},
   {name: "thingy3", price: "100"}
];

and have the prices deducted from the budget varible and then displayed in the template

p.s im using express and swig

javascript
node.js
express
swig-template

Answer 1

Your question is a little confusing so I hope this is the answer you want, you may want to consider re-wording it.

var budget = 300;
var expenses = [
   {name: "thingy1", price: "40"},
   {name: "thingy2", price: "30"},
   {name: "thingy3", price: "100"}
];
expenses.forEach(function (el) {budget -= el.price;});//Removes the price of each expense from the budget