JavaScript - reduce() on Object

In this article, we would like to show you how to use array reduce() method with objects in JavaScript.

Quick solution:

// ONLINE-RUNNER:browser;

const object = {
    a: 1,
    b: 2,
    c: 3,
};

const sum = Object.values(object).reduce((x, y) => x + y);

console.log(sum); // 6

Practical example

In this example, we present a more complex example with nested objects. We use reduce() method to sum amount property values for all groups.

// ONLINE-RUNNER:browser;

const groups = {
    group1: { amount: 1 },
    group2: { amount: 2 },
    group3: { amount: 3 },
};

const sum = Object.values(groups).reduce((x, { amount }) => x + amount, 0);

console.log(sum); // 6

References

1. Array.prototype.reduce() - JavaScript | MDN