The Object entries() method

Find out all about the JavaScript entries() method of the Object object

Introduced in ES2017.

This method returns an array containing all the object own properties, as an array of [key, value] pairs.

Usage:

const person = { name: 'Fred', age: 87 }
Object.entries(person) // [['name', 'Fred'], ['age', 87]]

Object.entries() also works with arrays:

const people = ['Fred', 'Tony']
Object.entries(people) // [['0', 'Fred'], ['1', 'Tony']]

You can use it to count the number of properties an object contains, combined with the length property of the array.