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how do you destroy, undeclare, unset variable?

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How do you destory a variable in autoit?

Example in ms-dos

set var=

Autoit attempts

"" sets as empty string

0 sets as numerical 0

<null> fails

$office_name = ""
$office_type = ""
$office_arch = ""
$office_path = ""
$office_script = ""
$office_setup = ""
$office_switch = ""

$office_name = 0
$office_type = 0
$office_arch = 0
$office_path = 0
$office_script = 0
$office_setup = 0
$office_switch = 0

$office_name =
$office_type =
$office_arch =
$office_path =
$office_script =
$office_setup =
$office_switch =

If IsDeclared("office_setup") Then ConsoleWrite($office_setup&@CRLF)
If IsDeclared("office_switch") Then ConsoleWrite($office_switch&@CRLF)

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If the variable is global in scope, you can't undeclare it. If it's a local variable, and in a function, it will automatically be destroyed after returning from the function, unless it's also a Static variable, and then all bets are off.

If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
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Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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You can assign a value to the variable that you interpret as "no value assigned". Like "", 0, -1 or NULL.

My UDFs and Tutorials:


Active Directory (NEW 2017-04-18 - Version - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2017-02-27 - Version - Download - General Help & Support - Example Scripts - Wiki
ExcelChart (2015-04-01 - Version - Download - General Help & Support - Example Scripts
Excel - Example Scripts - Wiki
Word - Wiki
PowerPoint (2015-06-06 - Version - Download - General Help & Support

ADO - Wiki


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