%q{Literals}

# Number literals
100
=> 100

20000000
=> 20000000

20_000_000
=> 20000000


def heredoc1

# String literals
"a string"
=> a string

'no interpolation'
=> "no interpolation"

a = 'inter'
"#{a}polation"
=> "interpolation"

"\n\t\"" + '"\''

# Regex literals
/[a-z0-9]+/
=> /[a-z0-9]+/

less_readable = /http:\/\/[a-z]+/
=> /http:\/\/[a-z]+/

more_readable = %r{http://[a-z]+}
=> /http:\/\/[a-z]+/

  puts <<MSG
    heredoc syntax with
    unindented end marker
  MSG
MSG
end
#    heredoc syntax with an
#    unindented end marker
#  MSG

def heredoc2
  puts <<-MSG
    heredoc syntax with an
    indented end marker
  MSG
end
#    heredoc syntax with an
#    indented end marker

def heredoc3
  puts <<~MSG
    heredoc syntax that strips
    whitespaces equal to the
      first line
  MSG
end
#heredoc syntax that strips
#whitespaces equal to the
#  first line


<<~INTERPOLATED
  #{5}
INTERPOLATED
=> "5\n"

<<~'UNINTERPOLATED'
  #{5}
UNINTERPOLATED

a = 5

# Percent literals
%i[big 3d #{a} "]
=> [:big, :"3d", :"\#{a}", :"\""]

%I[big 3d #{a} "]
=> [:big, :"3d", :"5", :"\""]

%w[big 3d #{a} "]
=> ["big", "3d", "\#{a}", "\""]

%W[big 3d #{a} "]
=> ["big", "3d", "5", "\""]

%q(a "b" 'c' #{a})
=> "a \"b\" 'c' \#{a}"

%Q(a "b" 'c' #{a})
=> "a \"b\" 'c' 5"

%(a "b" 'c' #{a})
=> "a \"b\" 'c' 5"

%s(mary's #{a} "twins")
=> :"mary's \#{a} \"twins\""

# Shell commands
`echo hello world`
=> "hello world\n"

%x{echo hello world}
=> "hello world\n"

less_readable = `echo \`ls\``
=> "main.rb Gemfile Gemfile.lock\n"
more_readable = %x{echo `ls`}
=> "main.rb Gemfile Gemfile.lock\n"

=> "\#{5}\n"

<<~`COMMANDHEREDOC`
  echo hello
COMMANDHEREDOC
=> "hello\n"

foo(<<-STR1, <<-STR2)
  You can pass multiple
STR1
  heredocs like this
STR2