Internally FastScript operates with the Variant type and is
based on it. Nevertheless, you can use the following predetermined types
in your scripts:

Byte      | Same as Integer type
Word      |
Integer   |
Longint   |
Cardinal  |
TColor    |
Boolean   | Boolean type
Real      | Same as Extended type
Single    |
Double    |
Extended  |
TDate     |
TTime     |
TDateTime |
Char      | Char type
String    | String type
Variant   | Same as Variant type
Pointer   |
Array     | Array type

C++Script maps some types to standard types:

int, long = Integer
void = Integer
bool = Boolean
float = Extended

JScript has no types, all types are variants. BasicScript may
have types (for example, dim i as Integer), or may have no types
and even no variable declaration. In this case, a variable will have
Variant type.

Not all of these types can be assign-compatible. As in in Object
Pascal, you cannot assign Extended or String to an
Integer. Only one type - the Variant can be assigned to all the
types and can get value from any type.

Except the built-in types, you can use the enumerated types defined in
your application or in add-in modules (for example, after adding the
TfsGraphicsRTTI component, you can use TPenMode, TFontStyles
and other types).