Is it necessary to use `do` after condition?

Question

• This is the official syntax for a while loop:

  while condition [do]
     code
  end
  

  But I saw some examples without the do after the condition. I was wondering if it is necessary.

• Is there a loop that is equivalent to the Java do...while loop? If so, then let me know please

Answer 1

The 'do' is optional for the while loop.

You can use:

begin
  # do something
end until quit == true

for a 'do...while' loop.