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Ruby Comments

A comment is a note inside code that Ruby ignores. Comments help people read the code around them.

A comment on its own line

The comment sits on its own line. The puts line below it still runs.

# Print a greeting
puts "Hello"

A comment after code

The comment sits after code on the same line. Only the code on that line runs.

puts "Hello again" # Say hello again

A block comment

A block comment sits between =begin and =end lines. Ruby ignores every line inside the block.

=begin
This block explains the program.
The greeting prints below the block.
=end
puts "Visible line"

Example

# Print the plan for today
puts "Plan for today"
puts "Write one program" # The second line of the plan

Key points

  • Use # to start a comment.
  • A comment can sit on its own line.
  • A comment can sit after code on the same line.
  • Ruby ignores the text of a comment.
  • A block comment starts with =begin on its own line.
  • A block comment ends with =end on its own line.

In this example, a comment sits above the first puts line. The first line prints Plan for today. A short comment sits after the second puts line, and that line prints Write one program.

Try it Yourself

Edit the code, then press Run.

Running is simulated · Programiz Ruby Compiler

Exercise

Which sign starts a comment in Ruby?