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Returns a left-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+,
left justified and padded on the right with +pad_string+:
'hello'.ljust(10) # => "hello "
' hello'.ljust(10) # => " hello "
'hello'.ljust(10, 'ab') # => "helloababa"
'тест'.ljust(10) # => "тест "
'こんにちは'.ljust(10) # => "こんにちは "
If +size+ is not greater than the size of +self+, returns a copy of +self+:
'hello'.ljust(5) # => "hello"
'hello'.ljust(1) # => "hello"
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