Difference Between Array.at and Array[idx]

Array.at(idx) is a method introduced in ES2022.

Let’s explore the differences between the traditional Array[idx] and Array.at(idx).

Differences

The most significant difference is the support for negative indices.

const arr = [10, 20, 30]
console.log(arr[-1]) // undefined

const arr = [10, 20, 30]
console.log(arr.at(-1)) // 30