and: Difference between revisions

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(Added description to parameters and links to commands used in examples to unify the page with a && b.)
m (Text replacement - "(\|[pr][0-9]+ *= *[^- ]*) *- *T([a-z ])" to "$1 - t$2")
 
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{{Command|= Comments
{{RV|type=command
____________________________________________________________________________________________


| ofp |= Game name
|game1= ofp
|version1= 1.00


|1.00|= Game version
|game2= ofpe
____________________________________________________________________________________________
|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). |= Description
|game3= arma1
____________________________________________________________________________________________
|version3= 1.00


| [[Boolean]] <nowiki>=</nowiki> a '''and''' 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


|game6= tkoh
|version6= 1.00


|s2= [[Boolean]] <nowiki>=</nowiki> a '''and''' b (''Only available since ArmA 2:OA v1.62.'') |= Syntax
|game7= arma3
|p21= a: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 1
|version7= 0.50
|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]]) and (_enemycount == 0)) then {[[hint]] "you win !"}</code> |= Example 1
|x2= <code>[[if]] (([[count]] _array > 0) and {(_array [[select]] 0) == [[player]]}) then {[[hint]] "It works! Without lazy evaluation it would throw an error if array was empty."}</code> |= Example 2


|mp= no special considerations|=
|gr1= Variables
____________________________________________________________________________________________


| [[a && b]], [[or]], [[Operators]] |= See also
|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 && b]]
 
|s1= a [[and]] b
 
|p1= a: [[Boolean]] - test condition or variable
 
|p2= b: [[Boolean]] - test condition or variable
 
|r1= [[Boolean]]
 
|s2= a [[and]] 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'' is [[false]]
 
|r2= [[Boolean]]
 
|x1= <sqf>
if ((not isNull player) and (alive player) and (_enemycount == 0)) then
{
hint "you win !";
};
</sqf>


<h3 style="display:none">Notes</h3>
|x2= <sqf>
<dl class="command_description">
if ((count _array > 0) and { (_array select 0) == player }) then // works as expected
<!-- Note Section BEGIN -->
{
<!-- Note Section END -->
hint "It works!";
</dl>
};


<h3 style="display:none">Bottom Section</h3>
if ((count _array > 0) and (_array select 0) == player) then // Error: _array select 0 is evaluated
{
hint "It... works?";
};
</sqf>


[[Category:Scripting Commands|AND]]
|seealso= [[a && b]] [[or]] [[Operators]]
[[Category:Scripting Commands OFP 1.96|AND]]
}}
[[Category:Scripting Commands OFP 1.46|AND]]
[[Category:Scripting Commands ArmA|AND]]
[[Category:Command_Group:_Math|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting Commands ArmA2|{{uc:{{PAGENAME}}}}]]
[[Category:Scripting_Commands_Take_On_Helicopters|{{uc:{{PAGENAME}}}}]]

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 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 && b
Groups:
VariablesMath

Syntax

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

Alternative Syntax

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

Examples

Example 1:
if ((not isNull player) and (alive player) and (_enemycount == 0)) then { hint "you win !"; };
Example 2:
if ((count _array > 0) and { (_array select 0) == player }) then // works as expected { hint "It works!"; }; if ((count _array > 0) and (_array select 0) == player) then // Error: _array select 0 is evaluated { hint "It... works?"; };

Additional Information

See also:
a && b 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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