Ruby Comments

Comments are non executable code which describes the programming code.

Like Perl, Bash, and C Shell, Ruby uses the hash symbol (also called Pound Sign, number sign, Square, or octothorpe) for comments. Everything from the hash to the end of the line is ignored when the program is run by Ruby. For example, here's our hello-world.rb program with comments.

# My first Ruby program
# On my way to Ruby fame & fortune!
 
puts 'Hello world'

click on execute to see its output

You can append a comment to the end of a line of code, as well. Everything before the hash is treated as normal Ruby code.

puts 'Hello world'                # Print out "Hello world"

Click on execute to see its output, change the code to try different output/text

You can also comment several lines at a time:

=begin
This program will
print "Hello world".
=end
 
puts 'Hello world'

Click on execute to see its output