JS Practice — Built-in Objects

Advanced — filterNullish

📖 Usage Example

filterNullish([1, null, 2, undefined, 3])   // → [1, 2, 3]

Using a type predicate filter removes null and undefined, narrowing the array element type.

Advanced Patterns: filterNullish

Challenge: Implement filterNullish<T>(arr: (T | null | undefined)[]): T[] returning only non-null, non-undefined values.

filterNullish([1, null, 2, undefined, 3])  // → [1, 2, 3]

💡 Hints (1)