How to divide an array in half in JavaScript
How can you divide an array in 2 parts, divided exactly in the middle?
Use the Array instance slice()
method:
const list = [1, 2, 3, 4, 5, 6]
const half = Math.ceil(list.length / 2);
const firstHalf = list.slice(0, half)
const secondHalf = list.slice(half)
If the list contains an even number of items, the result is split with exactly half the items.
If the number is odd, for example
[1, 2, 3, 4, 5]
The result will be
[ 1, 2, 3 ]
[ 4, 5 ]
→ Here's my latest YouTube video
→ Get my JavaScript Beginner's Handbook
→ 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