and: Difference between revisions

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{{RV|type=command
{{RV|type=command


| ofp
|game1= ofp
|version1= 1.00


|1.00
|game2= ofpe
|version2= 1.00
 
|game3= arma1
|version3= 1.00
 
|game4= arma2
|version4= 1.00
 
|game5= arma2oa
|version5= 1.50
 
|game6= tkoh
|version6= 1.00
 
|game7= arma3
|version7= 0.50


|gr1= Variables
|gr1= Variables
Line 9: Line 26:
|gr2= Math
|gr2= Math


| 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).
|descr= Returns [[true]] only if both conditions are [[true]].
In case of the alternative syntax, {{Wikipedia|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]]


| [[Boolean]] <nowiki>=</nowiki> a '''and''' b
|s2= a [[and]] b
|p1= a: [[Boolean]] - Test condition or variable that returns [[Boolean]].
|p2= b: [[Boolean]] - Test condition or variable that returns [[Boolean]].
| [[Boolean]]


|s2= [[Boolean]] <nowiki>=</nowiki> a '''and''' b (''Only available since Arma 2:OA v1.62.'')
|s2since= arma2oa 1.62


|p21= a: [[Boolean]] - Test condition or variable that returns [[Boolean]].
|p21= a: [[Boolean]] - Test condition or variable
|p22= b: [[Code]] - Code that returns [[Boolean]]. It is not evaluated if '''a''' returns as [[false]].
|r2= [[Boolean]]
 
|x1= <code>[[if]] (([[alive]] [[player]]) and (_enemycount == 0)) then {[[hint]] "you win !"}</code>
|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>


|mp= no special considerations
|p22= b: [[Code]] - Code that returns [[Boolean]]. It is '''not''' evaluated if ''a'' is [[false]]


|seealso= [[a && b]], [[or]], [[Operators]]
|r2= [[Boolean]]
}}


|x1= <code>[[if]] (([[not]] [[isNull]] [[player]]) [[and]] ([[alive]] [[player]]) [[and]] (_enemycount == 0)) [[then]]
{
[[hint]] "you win !";
};</code>


|x2= <code>[[if]] (([[count]] _array > 0) [[and]] { (_array [[select]] 0) == [[player]] }) [[then]] {{cc|works as expected}}
{
[[hint]] "It works!";
};


{{GameCategory|arma1|Scripting Commands}}
[[if]] (([[count]] _array > 0) [[and]] (_array [[select]] 0) == [[player]]) [[then]] {{cc|Error: {{ic|_array [[select]] 0}} is evaluated}}
{{GameCategory|arma2|Scripting Commands}}
{
{{GameCategory|arma3|Scripting Commands}}
[[hint]] "It... works?";
{{GameCategory|tkoh|Scripting Commands}}
};</code>


<dl class="command_description">
|seealso= [[a && b]], [[or]], [[Operators]]
<dt></dt>
}}
<dd class="notedate">Posted on April 12, 2015 - 10:45 (UTC)</dd>
<dt class="note">[[User:IT07|IT07]]</dt>
<dd class="note">
Just like the "or" command, the "and" command allows several conditions to be checked. Example: <br>
<code>if(alive player and speed player > 0 and _someOtherVar) then { hint"All three condtions are true" };</code>
The example above will check if the player is alive and if the player is moving and checks if _someOtherVar is true.
</dd>
</dl>

Revision as of 23:03, 10 August 2021

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 && borOperators

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=and&oldid=292620"