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PreDecrement
--
x decreases the value of x by 1, returning the new value of x.
PreDecrement has attribute HoldFirst.
--
x is equivalent to x
=
x
-1.
See the Mathematica book: Section 2.4.4.
See also: Decrement, SubtractFrom, Set.
Further Examples
This initializes the variable i to the value 7, decrements it, checks its value, and clears it.
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