isNull: Difference between revisions

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|r1= [[Boolean]]
|r1= [[Boolean]]


|x1= <code>if (isNull obj) then {[[hint]] "doesn't exist";};</code>
|x1= <code>if (isNull obj) then {hint "doesn't exist";};</code>


|seealso= [[controlNull]] [[displayNull]] [[grpNull]] [[locationNull]] [[objNull]] [[taskNull]] [[teamMemberNull]] [[scriptNull]] [[configNull]] [[typeName]]
|seealso= [[controlNull]] [[displayNull]] [[grpNull]] [[locationNull]] [[objNull]] [[taskNull]] [[teamMemberNull]] [[scriptNull]] [[configNull]] [[typeName]]
}}
}}

Revision as of 11:13, 12 May 2022

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Hover & click on the images for description

Description

Description:
Checks whether the tested item is null.
Which null type the item has to be equal to depends on the type of game entity tested:
Type Object Group Control Display Location Task Script Config Diary Record
Null value objNull grpNull controlNull displayNull locationNull taskNull scriptNull configNull diaryRecordNull
Since Logo A0.png1.00 Logo A0.png1.00 Logo A1 black.png1.00 Logo A1 black.png1.00 Logo A2.png1.00 Logo A2.png1.00 Arma 3 logo black.png1.30 Arma 3 logo black.png1.54 Arma 3 logo black.png2.00
⚠
A test via == does not work, because a null value is not equal to anything, not even itself (configNull being the exception). See also isEqualTo.
Problems:
teamMemberNull for Team Member type is not supported. Use private _isNull = _teamMember isEqualTo teamMemberNull instead.
Groups:
Variables

Syntax

Syntax:
isNull entity
Parameters:
entity: Object, Control, Display, Group, Location, Task, Script, Config or Diary Record
Return Value:
Boolean

Examples

Example 1:
if (isNull obj) then {hint "doesn't exist";};

Additional Information

See also:
controlNull displayNull grpNull locationNull objNull taskNull teamMemberNull scriptNull configNull typeName

Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
Retrieved from "https://community.bistudio.com/wiki?title=isNull&oldid=312920"