# Function Reference

# IsBool

Checks if a variable's base type is boolean.

IsBool ( variable )

## Parameters

variable | The variable/expression to check.

## Return Value

Success: | 1.
Failure: | 0 if expression is not boolean type.

## Remarks

See language datatypes for a detailed description.

## Related

IsArray, IsBinary, IsFloat, IsHWnd, IsInt, IsMap, IsNumber, IsPtr, IsString, VarGetType

## Example

    #include <MsgBoxConstants.au3>

    Local $bBoolean = True
    If IsBool($bBoolean) Then
        MsgBox($MB_SYSTEMMODAL, "", "The variable is boolean")
    Else
        MsgBox($MB_SYSTEMMODAL, "", "The variable is not boolean")
    EndIf