isNil

-wrong parameter ("Arma") defined!- 1.00

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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.

 

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

Additional Information

See also:

nilVariables

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