1 Returns a left-justified copy of +self+.
3 If integer argument +size+ is greater than the size (in characters) of +self+,
4 returns a new string of length +size+ that is a copy of +self+,
5 left justified and padded on the right with +pad_string+:
7 'hello'.ljust(10) # => "hello "
8 ' hello'.ljust(10) # => " hello "
9 'hello'.ljust(10, 'ab') # => "helloababa"
10 'тест'.ljust(10) # => "тест "
11 'こんにちは'.ljust(10) # => "こんにちは "
13 If +size+ is not greater than the size of +self+, returns a copy of +self+:
15 'hello'.ljust(5) # => "hello"
16 'hello'.ljust(1) # => "hello"