Trying to understand, I am still looking for my next front end language. Isn't immutability a problem in a garbage collected environment? I come from a C++ and

Trying to understand, I am still looking for my next front end language. Isn't immutability a problem in a garbage collected environment? I come from a C++ and ActionScript background, and on the ActionScript side garbage collection was a major issue. Would I not have the same if not worse issues in Elm?