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


|gr1= Math |GROUP1=
|game2= ofpe
|gr2= Variables |GROUP2=
|version2= 1.00


| Returns [[true]] only if both conditions are [[true]]. In case of the alternative syntax, [http://en.wikipedia.org/wiki/Lazy_evaluation#Control_structures lazy evaluation] is used (if left operand is [[false]], evaluation of the right side is skipped completely).
|game3= arma1
|version3= 1.00


{{Informative | This command is identical to the [[and]] command.}} |DESCRIPTION=
|game4= arma2
|version4= 1.00


| booleanA [[a && b|&&]] booleanB |SYNTAX=
|game5= arma2oa
|version5= 1.50


|p1= booleanA: [[Boolean]] - test condition or variable |PARAMETER1=
|game6= tkoh
|version6= 1.00


|p2= booleanB: [[Boolean]] - test condition or variable |PARAMETER2=
|game7= arma3
|version7= 0.50


| [[Boolean]] |RETURNVALUE=
|gr1= Variables


|s2=  boolean [[a && b|&&]] code {{Since|arma2oa|1.62|y}} |SYNTAX2=
|gr2= Math


|p21= boolean: [[Boolean]] - test condition or variable |PARAMETER21=
|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.


|p22= code: [[Code]] - code that once executed returns a [[Boolean]]. The code is not evaluated if '''boolean''' is [[false]]. |PARAMETER22=
|alias= [[a and b]]


|r2= [[Boolean]] |RETURNVALUE2=
|s1= booleanA [[a && b|&&]] booleanB


|x1= <code>[[private]] _allEnemiesKilled = [[true]];
|p1= booleanA: [[Boolean]] - Test condition or variable
[[if]] ([[alive]] [[player]] && _allEnemiesKilled) [[then]]
 
|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 !";
hint "you win !";
};</code> |EXAMPLE1=
};</sqf>


|x2= <code>[[if]] (([[count]] _array > 0) && { (_array [[select]] 0) == [[player]] }) [[then]] {{cc|an error would be thrown without lazy evaluation}}
|x2= <sqf>if ((count _array > 0) && { (_array select 0) == player }) then // an error would be thrown without lazy evaluation
{
{
[[hint]] "It works!";
hint "It works!";
};</code> |EXAMPLE2=
};</sqf>


|x3= <code>[[if]] (([[alive]] [[player]]) && { [[player]] [[setDamage]] 0.5; [[true]] }) [[then]] {{cc|valid '''as long as''' the code block returns a [[Boolean]]}}
|x3= <sqf>if ((alive player) && { player setDamage 0.5; true }) then // valid AS LONG AS the code block returns a Boolean
{
{
[[hint]] "It works!";
hint "It works!";
};</code> |EXAMPLE3=
};</sqf>


| [[and]], [[or]], [[Operators]] |SEEALSO=
|seealso= [[and]] [[or]] [[Operators]]
}}
}}
<h3 style="display:none">Bottom Section</h3>
[[Category:Scripting Commands OFP 1.46|#]]
[[Category:Scripting Commands OFP 1.96|#]]
[[Category:Scripting Commands OFP 1.99|#]]
{{GameCategory|arma1|Scripting Commands|sortKey=#}}
{{GameCategory|arma2|Scripting Commands|sortKey=#}}
{{GameCategory|arma3|Scripting Commands|sortKey=#}}
{{GameCategory|tkoh|Scripting Commands|sortKey=#}}

Revision as of 23:11, 23 February 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 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=338043"