typeExpression

typeExpression
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Two operators over data type.

Figure 6.22. typeExpression

Table 6.4. Binary Logical Operators

Operator	Meaning	Operand Types	Result Type
instanceof	Is this object of the specified type	Object instanceof Type	Boolean
as	Convert this object to the specified type	Object as Type	Object (of type Type)

For example:

function toString(val : Object) : String {
   if (val instanceof String) 
      val as String 
   else 
      "Not a String"
}

This example function uses instanceof to check if the input is a String, and if it is, it changes the type of the expression to String using the as operator.

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