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Returns a copy of +self+, left-justified and, if necessary, right-padded with the +pad_string+:
'hello'.ljust(10) # => "hello "
' hello'.ljust(10) # => " hello "
'hello'.ljust(10, 'ab') # => "helloababa"
'こんにちは'.ljust(10) # => "こんにちは "
If <tt>width <= self.length</tt>, returns a copy of +self+:
'hello'.ljust(5) # => "hello"
'hello'.ljust(1) # => "hello" # Does not truncate to width.
Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].
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