How to check if a JavaScript value is an array?
Find out how to determine if a JavaScript value is an array using the `Array.isArray()` method
Sometimes you got passed an object in a function, and you need to check if this is an array.
Maybe if it’s an array you perform some operation, and if it’s not an array you perform something else.
How can you determine if an object is an array?
Use the isArray()
static method provided by the Array
built-in object, introduced in ECMAScript 5:
const list = [1, 2, 3]
Array.isArray(list) //true
→ I wrote 17 books to help you become a better developer, download them all at $0 cost by joining my newsletter
→ JOIN MY CODING BOOTCAMP, an amazing cohort course that will be a huge step up in your coding career - covering React, Next.js - next edition February 2025