JS Practice — Built-in Objects

Array.prototype.at() — get middle element

📖 Usage Example

const arr = ['x', 'y', 'z']
arr[arr.length - 1]  // → 'z'  (bracket)
arr.at(-1)           // → 'z'  (at — cleaner)

Prefer at() over bracket notation when accessing the last element — it avoids manual length arithmetic.

Array.prototype.at() — computed indices

.at() can accept computed indices just like bracket notation. For an odd-length array, the middle element is at index Math.floor(arr.length / 2).

Challenge: Implement getMiddle(arr) that returns the middle element of an odd-length array using .at().

getMiddle([1, 2, 3, 4, 5]) // → 3
getMiddle([10, 20, 30])    // → 20

💡 Hints (2)