3th of 38 Questions.
What are Iterator Helpers (.map(), .filter(), .take(), .drop() on iterators natively)? What stage are they at in the TC39 proposal pipeline?
Iterator Helpers add chainable methods to iterators, enabling functional composition. The proposal is at Stage 3 (as of early 2025), awaiting implementation in engines.
Iterator Helpers would add methods like .map(), .filter(), .take(), .drop(), .flatMap(), etc., to the Iterator prototype, allowing lazy transformations without creating intermediate arrays. As of 2025, the proposal is at Stage 3, meaning it's stable and ready for implementation, but not yet fully available in all environments without a polyfill.