isNil: Difference between revisions
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Lou Montana (talk | contribs) m (Text replacement - " \| *(([^=\| ]+)('''|\[\[)([^=\| ]+)) * \|p1=" to " |s1= $1 |p1=") |
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{{Feature | Informative | {{GVI|ofp|1.00}} This command doesn't exist in {{ofp}} but can be emulated (see '''[[#Examples|Example 5]]''').}} | {{Feature | Informative | {{GVI|ofp|1.00}} This command doesn't exist in {{ofp}} but can be emulated (see '''[[#Examples|Example 5]]''').}} | ||
| [[isNil]] variableName | |s1= [[isNil]] variableName | ||
|p1= variableName: [[String]] - name of a [[missionNamespace]] variable (e.g "someVar") or a local variable (e.g "_someVar") | |p1= variableName: [[String]] - name of a [[missionNamespace]] variable (e.g "someVar") or a local variable (e.g "_someVar") | ||
Revision as of 00:06, 13 June 2021
Description
- Description:
- Description needed
- Groups:
- Variables
Syntax
- Syntax:
- isNil variableName
- Parameters:
- variableName: String - name of a missionNamespace variable (e.g "someVar") or a local variable (e.g "_someVar")
- Return Value:
- Return value needed
Alternative Syntax
- Syntax:
- isNil code
- Parameters:
- code: Code - code to evaluate:
- the code will be executed;
isNil { player setDamage 1; };will kill the player - the code will not be allowed to suspend while expression is evaluated, even if the parent scope allows it (see Example 4).
- the code will be executed;
- Return Value:
- Boolean - true if code returns something other than Nothing
Examples
- Example 1:
if (isNil "pokus") then { pokus = 0; };- Example 2:
isNil { player getVariable "someVar" };- Example 3:
_myArray = [0, 1]; isNil { _myArray select 0 }; // returns false isNil { _myArray select 1 }; // returns false isNil { _myArray select 2 }; // returns true isNil { _myArray select 3 }; // throws a script error. only length+1 select is allowed- Example 4:
- You can do this trick to force execute something in Unscheduled Environment.
spawn { systemChat str canSuspend; // chat shows true isNil {hint str canSuspend}; // hint shows false }; - Example 5:
- Operation Flashpoint workaround:
SQS syntax:_nil = format ["%1", _undefinedVariable] ? (format ["%1", foo] == _nil) : foo = "value"SQF syntax:_nil = format ["%1", _undefinedVariable]; if (format ["%1", foo] == _nil) then { foo = "value"; };
Additional Information
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