JS Practice — Built-in Objects

Array.prototype.splice() — remove an element

📖 Usage Example

const arr = [1, 2, 3, 4, 5]
arr.splice(1, 2)  // → [2, 3]  (removed)
arr  // → [1, 4, 5]

Use splice(start, deleteCount) to remove elements from an array in place.

Array.prototype.splice()

Array.prototype.splice(start, deleteCount, ...items) mutates the array by removing and/or inserting elements. It returns an array of the removed elements.

Challenge: Implement removeAt(arr, index) that removes 1 element at index and returns the mutated array.

removeAt([1, 2, 3, 4], 1) // → [1, 3, 4]
removeAt([10, 20, 30], 0) // → [20, 30]

💡 Hints (2)

• `splice(index, 1)` removes exactly one element at the given index.
• `splice` mutates the array in place — no need to reassign.