Is there any "undo" button in solo learn CODE PLAYGROUND? Also, can I add new class in my code? "Inheritance".

Answer 1

Nope, unfortunately there's no undo feature @ Code Playground.
And yes you can add your custom class (at least in C# and Java) with appropriate access modifier and you're good to go! 😉

Answer 2

If you’re using the web version, control+z will undo. Otherwise there’s not much you can do

Answer 3

I wonder why they don't have undo feature in mobile version. 🙁

Answer 4

I have a keyboard that has a Ctrl button when in landscape mode. There I can use any Ctrl function. Good for programming, too!
https://play.google.com/store/apps/details?id=org.pocketworkstation.pckeyboard