JS Practice — Built-in Objects

Array.prototype.slice() — remove first and last

📖 Usage Example

const arr = [1, 2, 3, 4, 5]
arr.slice(1)       // → [2, 3, 4, 5]  (remove first)
arr.slice(0, -1)   // → [1, 2, 3, 4]  (remove last)

Use slice() to exclude the first or last element without mutating the array.

Array.prototype.slice() — interior elements

arr.slice(1, -1) removes the first and last element, returning only the interior items. This is useful for stripping delimiters or boundary values.

Challenge: Implement withoutFirstAndLast(arr) that returns arr.slice(1, -1).

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

💡 Hints (2)