Examples of the use of percent and literal characters in Ruby _ruby topics

A single line string that needs to be interpolated and embedded with double quotes uses% () (abbreviated as%Q). Multi-line string, preferably with Heredocs.

  # bad (no interpolation needed)
  % (<div class= "text" >some text</div>)
  # should to be ' <div class= ' Text ' >some text</div> '

  # Bad (no double-quotes)
  % (the This is #{quality} style)
  # should be ' this is #{qu Ality} style "

  # bad (multiple lines)
  % (<div>\n<span class= ' big ' >#{exclamation}</span>\n </div>)
  # should be a heredoc.

  # Good (requires interpolation, has quotes, single line)
  % (<tr><td class= "name" >#{name}</td>)

No ' and ' strings do not use%q. Normal strings are more readable unless many characters need to be escaped.

  # bad
  name =%q (Bruce Wayne) Time
  =%q (8 o ' clock)
  question =%q ("What did for you say?")

  # good
  name = ' Bruce Wayne ' time
  = ' 8 o ' clock '
  question = ' What did you say? '

The%r method is only suitable for defining regular expressions that contain multiple/symbols.

  # bad
  %r (\s+)

  # still-
  %r (^/(. *) $)
  # should be/^\/(. *) $/

  # good
  %r (^/blog/2011/(. *) $)

Do not use%x unless you have used an inverted quotation mark in the command you invoked (this is uncommon).

  # bad
  date =%x (date)

  # good
  date = ' Date '
  echo =%x (echo ' Date ')

Do not use%s. Communities tend to use: "Some string" to create symbols that contain whitespace.

Use () with% literal, except for%r. Because curly braces often appear in regular expressions in many scenes, characters that are less common in many scenes, such as {as delimiters, may be a better choice, depending on the contents of the regular formula.

  # bad
  %w[one two three]
  %q{"Test ' king!", John said.}

  # good
  %w (one Two three)
  %q ("Test ' king!", John said.)