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Returns the byte at zero-based +index+ as an integer:
s = 'foo'
s.getbyte(0) # => 102
s.getbyte(1) # => 111
s.getbyte(2) # => 111
Counts backward from the end if +index+ is negative:
s.getbyte(-3) # => 102
Returns +nil+ if +index+ is out of range:
s.getbyte(3) # => nil
s.getbyte(-4) # => nil
More examples:
s = 'こんにちは'
s.bytes # => [227, 129, 147, 227, 130, 147, 227, 129, 171, 227, 129, 161, 227, 129, 175]
s.getbyte(2) # => 147
Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
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