isNil: Difference between revisions
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Lou Montana (talk | contribs) m (Text replacement - "[[Category:Scripting_Commands_Take_On_Helicopters" to "[[Category:Scripting Commands Take On Helicopters") |
(Example 4) |
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| Line 27: | Line 27: | ||
|p21= code: [[Code]] - code to evaluate: | |p21= code: [[Code]] - code to evaluate: | ||
* the code '''will''' be executed; {{Inline code|[[isNil]] { [[player]] [[setDamage]] 1; };}} ''will'' kill the player | * the code '''will''' be executed; {{Inline code|[[isNil]] { [[player]] [[setDamage]] 1; };}} ''will'' kill the player | ||
* the code will not be allowed [[canSuspend|to suspend]] while expression is evaluated, even if the parent scope allows it. | * the code will not be allowed [[canSuspend|to suspend]] while expression is evaluated, even if the parent scope allows it (Example 4). | ||
|Parameter 21= | |Parameter 21= | ||
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[[isNil]] { _myArray [[select]] 3 }; {{cc|throws a script error. only length+1 select is allowed}} | [[isNil]] { _myArray [[select]] 3 }; {{cc|throws a script error. only length+1 select is allowed}} | ||
</code> |Example 3= | </code> |Example 3= | ||
|x4= You can do this trick to force execute something in [[Scheduler|Unscheduled Environment]].<code>[[spawn]] { | |||
[[systemChat]] [[str]] [[canSuspend]]; {{cc|[[true]]}} | |||
[[isNil]] {[[hint]] [[str]] [[canSuspend]]}; {{cc|[[false]]}} | |||
};</code> |Example 4= | |||
____________________________________________________________________________________________ | ____________________________________________________________________________________________ | ||
Revision as of 11:26, 14 May 2020
Description
- Description:
- Tests whether the variable given by its name is nil or undefined, or whether the given expression evaluates to nil or Nothing.
ⓘ
1.00 isNil doesn't exist in Operation Flashpoint, you can emulate it:
// SQS syntax
_nil = format ["%1", _undefinedVariable]
? (format ["%1", foo] == _nil) : foo = "Hello World!"// SQF syntax
_nil = format ["%1", _undefinedVariable];
if (format ["%1", foo] == _nil) then { foo = "Hello World!"; }; - Groups:
- Uncategorised
Syntax
- Syntax:
- isNil variableName
- Parameters:
- variableName: String - name of a missionNamespace variable (e.g "someVar") or a local variable (e.g "_someVar")
- Return Value:
- Boolean - true if variable is nil
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 (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; // true isNil {hint str canSuspend}; // false };
Additional Information
Notes
-
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