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Microsoft® JScript™
delete Operator
 Language Reference 
Version 3 

See Also

Deletes a property from an object, or removes an element from an array.
delete expression

Where expression is a valid JScript expression that usually (but does not have to) result in a property name or array element.

If the result of expression is an object, and the property specified in expression exists, and the object will not allow it to be deleted, false is returned.

In all other cases true is returned.

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