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Underscore.
>>> 5+5
10
>>> _
10
>>> _ + 5
15
>>> _
15
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How to remove duplicate values from a multi-dimensional array in PHP
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No increment operator (++) in Ruby? [duplicate]
...s: -x == ---x == -----x == ...... To increment a number, simply write x += 1.
Taken from "Things That Newcomers to Ruby Should Know
" (archive, mirror)
That explains it better than I ever could.
EDIT: and the reason from the language author himself (source):
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