In this specific case (Elm vs. JavaScript) We're talking about JavaScript here, so: > - ubiquitous things, like data structures There are a few basic data str

In this specific case (Elm vs. JavaScript) We're talking about JavaScript here, so: > - ubiquitous things, like data structures There are a few basic data structures in JS, but almost everything else is in user-land. > - hard to get right things, like time Date is a notoriously bad API in JavaScript. - implementations of specs, like Unicode We just get a String type in JavaScript which is UTF-16, so...