iterator packages

Get the first fulfilled promise that satisfies the provided testing function

Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.

Filter object keys and values into a new object

Extra iterator adaptors, iterator methods, free functions, and macros.

Get an iterator for any JS language value. Works robustly across all environments, all versions.

Map over promises concurrently

Get the first path that exists on disk of multiple paths