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.