a && b: Difference between revisions

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[[Category:Scripting Commands|#]]
{{RV|type=command
[[Category:Scripting Commands OFP 1.97|#]]
[[Category:Scripting Commands OFP 1.46|#]]
[[Category:Scripting Commands ArmA|#]]


|sortKey= #


<h2 style="color:#000066">''' ''a'' && ''b'' '''</h2>
|game1= ofp
|version1= 1.00


|game2= ofpe
|version2= 1.00


'''Operand types:'''
|game3= arma1
|version3= 1.00


'''a:''' [[Boolean]]
|game4= arma2
|version4= 1.00


'''b:''' [[Boolean]]
|game5= arma2oa
|version5= 1.50


'''Type of returned value:'''
|game6= tkoh
|version6= 1.00


[[Boolean]]
|game7= arma3
|version7= 0.50


'''Description:'''
|gr1= Variables


a '''and''' b
|gr2= Math


|descr= Returns [[true]] only if both conditions are [[true]].
In case of the alternative syntax, {{Link|https://en.wikipedia.org/wiki/Lazy_evaluation#Control_structures|lazy evaluation}} is used - if left operand is [[false]], evaluation of the right side is ignored.


'''Example:'''
|alias= [[a and b]]


? ([[alive]] [[player]] '''&&''' [[alive]] [[leader unit|leader]] [[player]]) : [[hint]] "Both the player and his leader are alive"
|s1= booleanA [[a && b|&&]] booleanB
 
|p1= booleanA: [[Boolean]] - test condition or variable
 
|p2= booleanB: [[Boolean]] - test condition or variable
 
|r1= [[Boolean]]
 
|s2= boolean [[a && b|&&]] code
 
|s2since= arma2oa 1.62
 
|p21= boolean: [[Boolean]] - test condition or variable
 
|p22= code: [[Code]] - code that once executed returns a [[Boolean]]. The code is not evaluated if '''boolean''' is [[false]].
 
|r2= [[Boolean]]
 
|x1= <sqf>
private _allEnemiesKilled = true;
if (alive player && _allEnemiesKilled) then
{
hint "you win !";
};
</sqf>
 
|x2= <sqf>
if ((count _array > 0) && { (_array select 0) == player }) then // an error would be thrown without lazy evaluation
{
hint "It works!";
};
</sqf>
 
|x3= <sqf>
if ((alive player) && { player setDamage 0.5; true }) then // valid AS LONG AS the code block returns a Boolean
{
hint "It works!";
};
</sqf>
 
|seealso= [[and]] [[or]] [[Operators]]
}}

Latest revision as of 19:42, 3 September 2024

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 only if both conditions are true. In case of the alternative syntax, lazy evaluation is used - if left operand is false, evaluation of the right side is ignored.
Alias:
a and b
Groups:
VariablesMath

Syntax

Syntax:
booleanA && booleanB
Parameters:
booleanA: Boolean - test condition or variable
booleanB: Boolean - test condition or variable
Return Value:
Boolean

Alternative Syntax

Syntax:
boolean && code
Parameters:
boolean: Boolean - test condition or variable
code: Code - code that once executed returns a Boolean. The code is not evaluated if boolean is false.
Return Value:
Boolean

Examples

Example 1:
private _allEnemiesKilled = true; if (alive player && _allEnemiesKilled) then { hint "you win !"; };
Example 2:
if ((count _array > 0) && { (_array select 0) == player }) then // an error would be thrown without lazy evaluation { hint "It works!"; };
Example 3:
if ((alive player) && { player setDamage 0.5; true }) then // valid AS LONG AS the code block returns a Boolean { hint "It works!"; };

Additional Information

See also:
and or 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
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