This (anything can be a key) was eventually added with the Map class. They're an iterable type too, so they're much more useful than Objects imo. https://devel

This (anything can be a key) was eventually added with the Map class. They're an iterable type too, so they're much more useful than Objects imo. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...