isNil: Difference between revisions
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(Example 4) |
m (Tweak Example 4) |
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|x4= You can do this trick to force execute something in [[Scheduler|Unscheduled Environment]].<code>[[spawn]] { | |x4= You can do this trick to force execute something in [[Scheduler|Unscheduled Environment]].<code>[[spawn]] { | ||
[[systemChat]] [[str]] [[canSuspend]]; {{cc|[[true]]}} | [[systemChat]] [[str]] [[canSuspend]]; {{cc|chat shows [[true]]}} | ||
[[isNil]] {[[hint]] [[str]] [[canSuspend]]}; {{cc|[[false]]}} | [[isNil]] {[[hint]] [[str]] [[canSuspend]]}; {{cc|hint shows [[false]]}} | ||
};</code> |Example 4= | };</code> |Example 4= | ||
____________________________________________________________________________________________ | ____________________________________________________________________________________________ | ||
Revision as of 06:12, 17 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; // chat shows true isNil {hint str canSuspend}; // hint shows false };
Additional Information
Notes
-
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