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-= (drecrement)

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 Operator   [other Operator type actions]

 Item   [operators of similar scope]

 Mathematical   [other Mathematical operators]




This assignment operator is a convenient shorthand for decrementing an attribute. For example, the two following statements are equivalent:

$MyNumber -= 3; 

$MyNumber = $MyNumber - 3; 

This operator may also be used with Lists and Sets