Hey all, Scala has a lot of really handy functions that are on arrays, maps, and a whole range of collections. (It's collection support is a lot bigger than ES's, anyway..) It would be nice to have these included (since we're already including .map, .foreach, etc..).
drop(n) // Drops the first n elements dropRight(n) // Drops the last n elements filter(fn) // Returns a sub-collection containing the elements that fn(elm) returned true fold(newColl, fn) // Folds the elements of the original collection into newColl given the results of fn getOrElese // Sugar for (.get === undefined) ? fillerValue : .get partition(fn) // Splits the collection into two sub-collections given the result of fn(elm) being true or false. take(n) // Take only the first n elements takeRight(n) // Take only the last n elements A.zip(B) // Creates a map from the two collections, treating A as the keys and B as the values Of course, there are more than just these that I've listed. http://www.scala-lang.org/api/current/scala/collection/Map.html A simple use case for these are all over in ES6. var arr = document.getElementsByTagName("a"); var externalElms = arr.filter(function(acc, item) { (/^https?:\/\//).test(item.href) }); Or, var arr = document.querySelector("div") var divMap = arr.fold(new Map, function(acc, item) { acc.add(item.id, item); }); -- Adam Shannon Developer University of Northern Iowa Sophomore -- Computer Science B.S. & Mathematics http://ashannon.us _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
