I just use APL for learning, but Dyalog APL provides hooks, forks, and various other operators (like @) for supporting functional programming. Their RIDE effort

I just use APL for learning, but Dyalog APL provides hooks, forks, and various other operators (like @) for supporting functional programming. Their RIDE effort supports a linux IDE, but not an Android one AFAIK. I personally find the APL notation substantially easier to start with over J because each symbol is more mnemonic for what it does and because each operator uses a single symbol which helps a lot with mentally tokenizing.