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+= (i.e. increment)

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 As at baseline

+= (i.e. increment)

This assignment operator is a convenient shorthand for incrementing 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, and += may be used to append strings:

$MyString += "!"