Better way to sum a property value in an array

Question

I have something like this:

$scope.traveler = [
            {  description: \'Senior\', Amount: 50},
            {  description: \'Senior\', Amount: 50},
             


        

Answer 1

I thought I'd drop my two cents on this: this is one of those operations that should always be purely functional, not relying on any external variables. A few already gave a good answer, using reduce is the way to go here.

Since most of us can already afford to use ES2015 syntax, here's my proposition:

const sumValues = (obj) => Object.keys(obj).reduce((acc, value) => acc + obj[value], 0);

We're making it an immutable function while we're at it. What reduce is doing here is simply this: Start with a value of 0 for the accumulator, and add the value of the current looped item to it.

Yay for functional programming and ES2015! :)