Returns the class name of a value.

ClassName := Type(Value)

Return Value

Type: String

This function returns the class name of Value.

The algorithm for determining a value's class name can be approximated as shown below:

    if (comClass := ComObjType(Value, "Class")) != ""
        return comClass
    try ; `Value is Object` is not checked because it can be false for prototypes.
        if ObjHasOwnProp(Value, "__Class")
            return "Prototype"
    while Value := ObjGetBase(Value)
        if ObjHasOwnProp(Value, "__Class")
            return Value.__Class
    return "Object"

For COM wrapper objects, the class name can also be determined based on the variant type, as follows:

    if ComObjType(obj) & 0x2000 ; VT_ARRAY
        return "ComObjArray" ; ComObjArray.Prototype.__Class
    if ComObjType(obj) & 0x4000 ; VT_BYREF
        return "ComValueRef" ; ComValueRef.Prototype.__Class
    if (ComObjType(obj) = 9 || ComObjType(obj) = 13) ; VT_DISPATCH || VT_UNKNOWN
        && ComObjValue(obj) != 0
        if (comClass := ComObjType(obj, "Class")) != ""
            return comClass
        if ComObjType(obj) = 9 ; VT_DISPATCH
            return "ComObject" ; ComObject.Prototype.__Class
    return "ComValue" ; ComValue.Prototype.__Class


This function typically shouldn't be used to determine if a value is numeric, since numeric strings are valid in math expressions and with most built-in functions. However, in some cases the exact type of a value is more important. In such cases, consider using Value is Number or similar instead of Type.

To check if a value can be used as a number, use the IsNumber, IsInteger or IsFloat function.

To check for any type of object (that is, anything which is not a primitive value), use the IsObject function.

To check if a value is an instance of a specific class, use the is operator. This can be used even with primitive values or to identify COM wrapper objects.

Values, Expressions, Is functions, Integer, Float, String


Retrieves and reports the exact type of the values stored in a, b and c.

a := 1, b := 2.0, c := "3"
MsgBox Type(a)  ; Integer
MsgBox Type(b)  ; Float
MsgBox Type(c)  ; String