The three special types are the untyped specifier (*), Expressions that read from untyped properties are considered untyped expressions. Use of untyped expressions or properties is recommended in the following circumstances:
- When you want to defer type checking to runtime. You can use an untyped property or expression to circumvent compile-time type checking in strict mode. Note, however, that runtime type checking of assignment statements occurs whether you use strict mode or not.
- When you want to store the value
undefinedin a property. Unlike previous versions of ActionScript, the valueundefinedis not a member of the Object data type. You must use an untyped property to store the valueundefined.
Related API Elements
| void | Special Type |
functionName():void {}| Language Version: | ActionScript 3.0 |
| Runtime Versions: | Flash Player 9 |
Specifies that a function cannot return any value. The void type is a special type that contains exactly one value: undefined.
It is special in that its use is limited to the return type of a function. You cannot use void as a type annotation for a property.
Related API Elements
| Null | Special Type |
| Language Version: | ActionScript 3.0 |
| Runtime Versions: | Flash Player 9 |
A special data type that represents the lack of a value. The Null data type includes only one value: null. The Null data type is special in that it is not associated with a class. This means that you cannot use the Null data type as a type annotation for a property.
Related API Elements
Mon Apr 10 2017, 01:43 PM -07:00