a or b: Difference between revisions

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#REDIRECT [[Operators]]
{{RV|type=command
 
|sortKey= #
 
|game1= ofp
|version1= 1.00
 
|game2= ofpe
|version2= 1.00
 
|game3= arma1
|version3= 1.00
 
|game4= arma2
|version4= 1.00
 
|game5= arma2oa
|version5= 1.50
 
|game6= tkoh
|version6= 1.00
 
|game7= arma3
|version7= 0.50
 
|gr1= Math
 
|gr2= Variables
 
|descr= Returns [[true]] if one or both conditions are [[true]]. In case of the alternative syntax, {{Link|https://en.wikipedia.org/wiki/Lazy_evaluation#Control_structures|lazy evaluation}} is used. That means that if left operand is [[true]], evaluation of the right side is skipped completely.
 
|alias= [[or]]
 
|s1= a [[a or b|{{!}}{{!}}]] b
 
|p1= a: [[Boolean]] - test condition or variable
 
|p2= b: [[Boolean]] - test condition or variable
 
|r1= [[Boolean]]
 
|s2= a [[a or b|{{!}}{{!}}]] b
 
|s2since= arma2oa 1.62
 
|p21= a: [[Boolean]] - test condition or variable
 
|p22= b: [[Code]] - code that returns [[Boolean]]. It is not evaluated if ''a'' returns [[true]]
 
|r2= [[Boolean]]
 
 
|x1= <sqf>if (OBJ1 || _enemycount == 0) then { hint "you win !" };</sqf>
 
|x2= <sqf>
if (count _array == 0 || { (_array select 0) != player }) then
{
hint "It works! Without lazy evaluation it would throw an error if array was empty.";
};
</sqf>
 
|seealso= [[or]] [[and]] [[Operators]]
}}

Latest revision as of 15:51, 8 November 2023

Logo A0.png1.00ofpe logo.png1.00Logo A1 black.png1.00Logo A2.png1.00A2 OA Logo.png1.50tkoh logo small.png1.00Arma 3 logo black.png0.50
Hover & click on the images for description

Description

Description:
Returns true if one or both conditions are true. In case of the alternative syntax, lazy evaluation is used. That means that if left operand is true, evaluation of the right side is skipped completely.
Alias:
or
Groups:
MathVariables

Syntax

Syntax:
a || b
Parameters:
a: Boolean - test condition or variable
b: Boolean - test condition or variable
Return Value:
Boolean

Alternative Syntax

Syntax:
a || b
Parameters:
a: Boolean - test condition or variable
b: Code - code that returns Boolean. It is not evaluated if a returns true
Return Value:
Boolean

Examples

Example 1:
if (OBJ1 || _enemycount == 0) then { hint "you win !" };
Example 2:
if (count _array == 0 || { (_array select 0) != player }) then { hint "It works! Without lazy evaluation it would throw an error if array was empty."; };

Additional Information

See also:
or and Operators

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
Retrieved from "https://community.bistudio.com/wiki?title=a_or_b&oldid=349256"