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Flash Player 6.
object instanceof class
object An ActionScript object.
class A reference to an ActionScript constructor function, such as String or Date.
If object is an instance of class, instanceof returns true; otherwise, instanceof returns false. Also, _global instanceof Object returns false.
Operator; determines whether an object belongs to a specified class. Tests whether object is an instance of class.
The instanceof operator does not convert primitive types to wrapper objects. For example, the following code returns true:
new String("Hello") instanceof String;
Whereas the following code returns false:
"Hello" instanceof String;
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