a && b: Difference between revisions

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(Added lazy evaluation syntax)
m (Text replacement - "<sqf>([^↵][^<]*↵[^<]*)<\/sqf>" to "<sqf> $1 </sqf>")
 
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{{Command|= Comments
{{RV|type=command
____________________________________________________________________________________________


| ofp |= Game name
|sortKey= #


|1.00|= Game version
|game1= ofp
____________________________________________________________________________________________
|version1= 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).
|game2= ofpe
|version2= 1.00


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


| [[Boolean]] <nowiki>=</nowiki> a '''&&''' b |= Syntax
|game4= arma2
|p1= a: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 1
|version4= 1.00
|p2= b: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 2
| [[Boolean]] |= Return value


|game5= arma2oa
|version5= 1.50


|s2= [[Boolean]] <nowiki>=</nowiki> a '''&&''' b (''Only available since ArmA 2:OA v1.62.'') |= Syntax
|game6= tkoh
|p21= a: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 1
|version6= 1.00
|p22= b: [[Code]] - Code that returns [[Boolean]]. It is not evaluated if '''a''' returns as true. |= Parameter 2
|r2= [[Boolean]] |= Return value
____________________________________________________________________________________________


|x1= <code>[[if]] (([[alive]] [[player]]) && (_enemycount == 0)) then {[[hint]] "you win !"}</code> |= Example 1
|game7= arma3
|x2= <code>[[if]] (([[count]] _array > 0) && {(_array [[select]] 0) == [[player]]}) then {[[hint]] "It works! Without lazy evaluation it would throw an error if array was empty."}</code> |= Example 2
|version7= 0.50
____________________________________________________________________________________________


| [[and]], [[or]], [[Operators]] |= See also
|gr1= Variables
|mp= no special considerations|=


}}
|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.
 
|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]].
 
|r2= [[Boolean]]


<h3 style="display:none">Notes</h3>
|x1= <sqf>
<dl class="command_description">
private _allEnemiesKilled = true;
<!-- Note Section BEGIN -->
if (alive player && _allEnemiesKilled) then
{
hint "you win !";
};
</sqf>


<!-- Note Section END -->
|x2= <sqf>
</dl>
if ((count _array > 0) && { (_array select 0) == player }) then // an error would be thrown without lazy evaluation
{
hint "It works!";
};
</sqf>


<h3 style="display:none">Bottom Section</h3>
|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>


[[Category:Scripting Commands|#]]
|seealso= [[and]] [[or]] [[Operators]]
[[Category:Scripting Commands OFP 1.96|#]]
}}
[[Category:Scripting Commands OFP 1.46|#]]
[[Category:Scripting Commands ArmA|#]]
[[Category:Scripting Commands ArmA2|#]]
[[Category:Command_Group:_Math|#]]
[[Category:Command_Group:_Variables|#]]

Latest revision as of 19:42, 3 September 2024

Logo A0.png 1.00ofpe logo.png 1.00Logo A1 black.png 1.00Logo A2.png 1.00A2 OA Logo.png 1.50tkoh logo small.png 1.00Arma 3 logo black.png 0.50
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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