Empty IVector and IHashMap does not store values

[Heermod]

IHashMap<String, String> hashmap = IHashMap.empty(); hashmap.put('bar', 'foo'); print(hashmap.get('bar')); //None

IHashMap<String, String> hashmap = IHashMap.from({'bar': 'foo'}); hashmap.put('bar', 'baz'); print(hashmap.get('bar')); //Some(foo) How can I set a value?

[spebbe]

Hi @Heermod! All collections in dartz are immutable – that's what's so great about them! In your example above, hashmap.put returns a new instance of IHashMap, containing the new mapping while leaving hashmap unmodified. If you want mutable collections, you might be happier sticking with the built-in Dart List, Map, Set, etc.

Hope that helped!