# Function Reference

# IsArray

Checks if a variable is an array type.

IsArray ( variable )

## Parameters

variable | The variable/expression to check.

## Return Value

Success: | 1.
Failure: | 0 if parameter is not an array variable.

## Remarks

Can be useful to validate array/non-array parameters to user-defined functions.
See language datatypes for a detailed description.

## Related

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

## Example

    #include <MsgBoxConstants.au3>

    Example()

    Func Example()
        ; Run Notepad
        Run("notepad.exe")

        ; Wait 10 seconds for the Notepad window to appear.
        Local $hWnd = WinWaitActive("[CLASS:Notepad]", "")

        ; Retrieve the position and size of the Notepad window by passing the handle to WinGetPos.
        Local $aPos = WinGetPos($hWnd)

        ; Check if the variable is an array.
        If IsArray($aPos) Then
            MsgBox($MB_SYSTEMMODAL, "", "Window height: " & $aPos[3])
        Else
            MsgBox($MB_SYSTEMMODAL, "", "An error occurred.")
        EndIf

        ; Close the Notepad window using the handle returned by WinWaitActive
        WinClose($hWnd)
    EndFunc   ;==>Example