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based on an earlier version of the Wolfram Language.
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AddTo (+=)SubtractFrom (-=)

Decrement

FilledSmallSquarex-- decreases the value of x by 1, returning the old value of x.

FilledSmallSquareDecrement has attribute HoldFirst.

FilledSmallSquare See The Mathematica Book: Section 2.4.4.

FilledSmallSquare See also: PreDecrement, SubtractFrom, Set.

Further Examples

AddTo (+=)SubtractFrom (-=)