Comment (computer programming): Difference between revisions

Revision as of 13:57, 11 January 2025

Revision as of 14:02, 11 January 2025

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===Scripting===

A pattern in many [[scripting language]]s is to delimit a line comment with <code>#</code> and providevarying or no support for a block comment. Notable languages include: [[Bash (Unix shell)|Bash]], [[Raku (programming language)|Raku]], [[Ruby (programming language)|Ruby]], [[Perl]], [[Windows PowerShell|PowerShell]], [[Python (programming language)|Python]] and [[R (programming language)|R]].

An example in R:

Line 374:

# This is a comment

print("This is not a comment") # This is another comment

</syntaxhighlight>

====Block in Ruby====

A block comment is delimited by <code>=begin</code> and <code>=end</code> that start a line. For example:

<syntaxhighlight lang="ruby">

puts "This is not a comment"

# this is a comment

puts "This is not a comment"

=begin

whatever goes in these lines

is just for the human reader

=end

puts "This is not a comment"

</syntaxhighlight>

Line 753 ⟶ 767:

}

</syntaxhighlight>

====Ruby====

Inline comments in [[Ruby (programming language)|Ruby]] start with the # character.

To create a multiline comment, one must place "=begin" at the start of a line, and then everything until "=end" that starts a line is ignored. Including a space after the equals sign in this case throws a syntax error.

<syntaxhighlight lang="ruby">

puts "This is not a comment"

# this is a comment

puts "This is not a comment"

=begin

whatever goes in these lines

is just for the human reader

=end

puts "This is not a comment"

</syntaxhighlight>