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ruby--ruby/doc/string/rjust.rdoc

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Returns a right-justified copy of +self+.
If integer argument +size+ is greater than the size (in characters) of +self+,
returns a new string of length +size+ that is a copy of +self+,
right justified and padded on the left with +pad_string+:
'hello'.rjust(10) # => " hello"
'hello '.rjust(10) # => " hello "
'hello'.rjust(10, 'ab') # => "ababahello"
'тест'.rjust(10) # => " тест"
'こんにちは'.rjust(10) # => " こんにちは"
If +size+ is not greater than the size of +self+, returns a copy of +self+:
'hello'.rjust(5, 'ab') # => "hello"
'hello'.rjust(1, 'ab') # => "hello"