sum

Problem

You need the total of a numeric array, optionally extracting a value from objects.

Solution

Use sum(array, callback?) to compute the sum.

import { sum } from '@vielzeug/arsenal';

sum([1, 2, 3, 4, 5]); // 15

const items = [
  { qty: 2, price: 5 },
  { qty: 1, price: 10 },
];
sum(items, (i) => i.qty * i.price); // 20

Pitfalls

• Returns 0 for empty arrays.

Related

• average
• allocate