and: Difference between revisions

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|descr= Returns [[true]] only if both conditions are [[true]].
|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.
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]]
|alias= [[a && b]]
Line 33: Line 33:
|s1= a [[and]] b
|s1= a [[and]] b


|p1= a: [[Boolean]] - Test condition or variable
|p1= a: [[Boolean]] - test condition or variable


|p2= b: [[Boolean]] - Test condition or variable
|p2= b: [[Boolean]] - test condition or variable


|r1= [[Boolean]]
|r1= [[Boolean]]
Line 43: Line 43:
|s2since= arma2oa 1.62
|s2since= arma2oa 1.62


|p21= a: [[Boolean]] - Test condition or variable
|p21= a: [[Boolean]] - test condition or variable


|p22= b: [[Code]] - Code that returns [[Boolean]]. It is '''not''' evaluated if ''a'' is [[false]]
|p22= b: [[Code]] - code that returns [[Boolean]]. It is '''not''' evaluated if ''a'' is [[false]]


|r2= [[Boolean]]
|r2= [[Boolean]]


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


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


if ((count _array > 0) [[and]] (_array [[select]] 0) == [[player]]) [[then]] // Error: {{ic|_array [[select]] 0 is evaluated}}
if ((count _array > 0) and (_array select 0) == player) then // Error: _array select 0 is evaluated
{
{
[[hint]] "It... works?";
hint "It... works?";
};</code>
};
</sqf>


|seealso= [[a && b]] [[or]] [[Operators]]
|seealso= [[a && b]] [[or]] [[Operators]]
}}
}}

Latest revision as of 15:51, 8 November 2023

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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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