a && b: Difference between revisions

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{{Command|= Comments
{{RV|type=command
____________________________________________________________________________________________


| ofp |= Game name
|sortKey= #


|1.00|= Game version
|game1= ofp
____________________________________________________________________________________________
|version1= 1.00


| Returns whether two values both are <tt>true</tt>.
|game2= ofpe
|version2= 1.00


Identical to: a '''[[and]]''' b |= Description
|game3= arma1
____________________________________________________________________________________________
|version3= 1.00


| a '''&&''' b |= Syntax
|game4= arma2
|version4= 1.00


|p1= a: a test condition or a variable that return a [[Boolean]] value |= Parameter 1
|game5= arma2oa
|version5= 1.50


|p2= b: a test condition or a variable that return a [[Boolean]] value |= Parameter 2
|game6= tkoh
|version6= 1.00


| [[Boolean]] |= Return value
|game7= arma3
____________________________________________________________________________________________
|version7= 0.50


|x1= <pre>if (alive player) and (enemycount==0) then {hint "you win"}</pre> |= Example 1
|gr1= Variables


| [[and]], [[Operators]] |= See also
|gr2= Math
|mp= no special considerations|=


}}
|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.
 
|alias= [[a and b]]
 
|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]].


<h3 style="display:none">Notes</h3>
|r2= [[Boolean]]
<dl class="command_description">
<!-- Note Section BEGIN -->


<!-- Note Section END -->
|x1= <sqf>
</dl>
private _allEnemiesKilled = true;
if (alive player && _allEnemiesKilled) then
{
hint "you win !";
};
</sqf>


<h3 style="display:none">Bottom Section</h3>
|x2= <sqf>
if ((count _array > 0) && { (_array select 0) == player }) then // an error would be thrown without lazy evaluation
{
hint "It works!";
};
</sqf>


[[Category:Scripting Commands|#]]
|x3= <sqf>
[[Category:Scripting Commands OFP 1.96|#]]
if ((alive player) && { player setDamage 0.5; true }) then // valid AS LONG AS the code block returns a Boolean
[[Category:Scripting Commands OFP 1.46|#]]
{
[[Category:Scripting Commands ArmA|#]]
hint "It works!";
};
</sqf>


[[Category:Command_Group:_Math|#]]
|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
Retrieved from "https://community.bistudio.com/wiki?title=a_%26%26_b&oldid=369259"