isNull: Difference between revisions

Revision as of 20:04, 4 September 2014

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Description:

Checks whether the tested item is Null.
Which null type the item has to be equal to depends on the type of object tested:

Note: A test via == does not work, because, for example, objNull is not equal to anything, not even to itself.

Groups:

Uncategorised

Syntax:: isNull obj
Parameters:: obj: Object, Control, Display, Group (or Location, Task since ARMA 2)
Return Value:: Boolean

See also:: controlNull displayNull grpNull locationNull objNull taskNull teamMemberNull

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@@ Line 51: / Line 51: @@
 [[Category:Scripting Commands Arma 3|{{uc:{{PAGENAME}}}}]]
 [[Category:Scripting_Commands_Take_On_Helicopters|{{uc:{{PAGENAME}}}}]]
+{{subst:Add new note/construct|
+<!--
+* Replace from here (including the arrow just above)
+* Please add your note here, replacing these comments
+* Please '''PREVIEW YOUR ADDITION BEFORE SAVING'''
+* Thank you
+* Equal symbols "=" should be added as "{{subst:=}}" (excluding quotes)
+* Pipes "|" should be added as "{{subst:!}}" (excluding quotes)
+* New lines should be forced by the use of "<br>" tags
+* Examples should be placed between tags <code>_like {{subst:=}} [[_this]];</code>
+* Replace to here (including the arrow just below)
+locationNull could be confusing when testing destinationTask :
+if a task is created, taskDestination returns an array working as position : _mytask_distance = (taskDestination (currentTask player)) distance player;
+When task completed Hint format ["%1", taskDestination (currentTask player)] returns <null> while !isnull taskdestination.. leads to an error.
+correct test : _destination_task = taskDestination (currentTask player); if (!isNil "_destination_tsk") then {...
+}}