Ruby

Comments are lines in computer programs that are ignored by compilers and interpreters. You can use comments to make your programs easier for other programmers to understand by providing more context or explanation what each part of a program is doing. In this tutorial, we will look at how to use comments in Ruby programs to leave notes, as well as how to use them as a debugging tool.

IRB, short for Interactive Ruby, is a REPL (read-eval-print loop) which serves as a quick way to explore the Ruby programming language and try out code without creating a file. In this tutorial, you’ll use IRB to run some code, inspect its output, bring in external libraries, and customize your IRB session.