try crystal
Type Crystal. It runs. It answers.
Lesson 1 of 3
Lesson
Lesson 1 of 3. Start by saying hello. puts writes a line of output, and it is about to give you your first answer from the machine.
The line
puts "Hello, Crystal!"Stuck? puts prints whatever follows it, on a line of its own. The double quotes make the words a String, and the capital letters count: the compiler is polite about many things, spelling is not one of them.
Output
This is real Crystal, running for real. No signup, no setup, three short
lessons. Whatever you write in the editor goes to a sandbox, gets compiled
and run by the actual toolchain, and answers back here.
Write the line from the lesson on the left, then press Run.