JS Practice — Built-in Objects

Insert Element Immutably

📖 Usage Example

const arr = [1, 2, 4, 5]
arr.toSpliced(2, 0, 3)  // → [1, 2, 3, 4, 5]
arr  // → [1, 2, 4, 5]  (unchanged)

Use toSpliced() to insert elements at a position without modifying the original array.

Array.prototype.toSpliced — Insert

Passing 0 as the delete count lets you insert elements without removing any.

Implement insertImmutable which returns a new array with val inserted at index.

💡 Hints (2)