The versions of those methods (map/filter/reduce/etc) that support any iterator (including upgrading NodeList "for free") have passed Stage 4 of the process, wh

The versions of those methods (map/filter/reduce/etc) that support any iterator (including upgrading NodeList "for free") have passed Stage 4 of the process, which means they will be in the next version of the standard and already starting to show up in some browsers. https://github.com/tc39/proposal-iterator-helpers https://github.com/tc39/proposal-iterator-helpers