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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"