1. By "already implemented entirely in vanilla js" you mean that there are native functions for everything? If so, no, it's not entirely useless. Check the art

1. By "already implemented entirely in vanilla js" you mean that there are native functions for everything? If so, no, it's not entirely useless. Check the article for examples where it isn't. 2. No, for most things there are several differences between what is on Lodash source code and the current native-Javascript implementation. Check this: https://news.ycombinator.com/item?id=35057549 https://news.ycombinator.com/item?id=35057549