# Get the nth element of a JavaScript array

Retrieving an element from a JavaScript array is most often done using its index. But what if we want to get the `nth`

element from the **end of the array**? Or, perhaps, get all **elements at an index that is a multiple** of `n`

? Let's see how we can do that.

## Get the nth element of a JavaScript array

Getting the `nth`

element of a JavaScript array can be easily done, using `Array.prototype.slice()`

. The only thing you need to keep in mind is **negative indexes**, which you can be used to get the last `nth`

element of the array.

const nthElement = (arr, n = 0) => (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0]; nthElement(['a', 'b', 'c'], 1); // 'b' nthElement(['a', 'b', 'b'], -3); // 'a' nthElement(['a', 'b', 'b'], 3); // undefined

## Get every nth element of a JavaScript array

If you need to get every `nth`

element of a JavaScript array, you can use `Array.prototype.filter()`

. Combined with the modulo operator (`%`

), you can use it to keep only the elements that are at every `nth`

position in the array.

const everyNth = (arr, nth) => arr.filter((e, i) => i % nth === nth - 1); everyNth([1, 2, 3, 4, 5, 6], 2); // [ 2, 4, 6 ]