str_pad

• Instead of padding text, Ruby arrives at a similar goal by justifying text to the left or right. We can left justify (STR_PAD_RIGHT) text using Ruby’s String#ljust method. Just like PHP’s str_pad function, we can specify the final string length along with the character we are using to pad.

  PHP

  $result = str_pad("Hello", 10);
  var_export($result);
  // => 'Hello     '
   
  $result = str_pad("Hello", 10, '-');
  var_export($result);
  // => 'Hello-----'

  Ruby

  p "Hello".ljust(10)
  # => "Hello     "
   
  p "Hello".ljust(10, '-')
  # => "Hello-----"

  We can right justify (STR_PAD_LEFT) text using a similar approach with Ruby’s String#rjust method.

  PHP

  $result = str_pad("Hello", 10, ' ', STR_PAD_LEFT);
  var_export($result);
  // => '     Hello'

  Ruby

  p "Hello".rjust(10)
  # => "     Hello"

  Padding on both sides (STR_PAD_BOTH) would require us to use both String#rjust and String#ljust in combination.

  PHP

  $result = str_pad("Hello", 10, ' ', STR_PAD_BOTH);
  var_export($result);
  // => '  Hello   '

  Ruby

  p "Hello".rjust(7).ljust(10)
  # => "  Hello   "

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