The author mentions iterator helpers [1], which could make stuff easier. However, there is also a different proposal that touches different similar issue which

The author mentions iterator helpers [1], which could make stuff easier. However, there is also a different proposal that touches different similar issue which might fix this too: The bind operator proposal [2]. Like the name implies, it allows to set the `this` for a function call. This opens the possibility to implement the common map/filter/reduce functions in a lazy manner _for arrays_. Taken from the samples, this could evaluate lazily on an array returned by `getPlayers()`. import { map, takeWhile, forEach } from "iterlib"; getPlayers() ::map(x => x.character()) ::takeWhile(x => x.strength > 100) ::forEach(x => console.log(x)); Of course, this could also be used for iterators. However, the binding operator is not very active any more. [1]: https://www.proposals.es/proposals/Iterator%20helpers https://www.proposals.es/proposals/Iterator%20helpers [2]: https://github.com/tc39/proposal-bind-operator https://github.com/tc39/proposal-bind-operator