Can I undo a move while coding?

Answer 1

i am using a tablet with an additional usb keyboard connected by bluetooth. so it is possible to:

undo - by using Ctrl + y
redo - by using Ctrl + z

Answer 2

// With
continue; // or
breack; // return;
// you have an additional control for the loops.

Answer 3

Yes

Eg. - Undo code deleted
- Undo code inserted