average

Problem

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

Solution

Use average(array, callback?) to compute the mean.

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

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

const products = [{ price: 10 }, { price: 20 }, { price: 30 }];
average(products, (p) => p.price); // 20

Pitfalls

• Returns NaN for an empty array.

Related

• sum
• median