a or b: Difference between revisions

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(Added lazy evaluation syntax)
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| Returns whether either one of the two values is [[true]].
| Returns [[true]] only if one or 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 [[true]], evaluation of the right side is skipped completely).


Identical to: a [[or]] b |= Description
Identical to: a [[or]] b |= Description
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| a <nowiki>||</nowiki> b|= Syntax
| [[Boolean]] <nowiki>=</nowiki> a '''<nowiki>||</nowiki>''' b |= Syntax
|p1= a: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 1
|p2= b: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 2
| [[Boolean]] |= Return value


|p1= a: [[Boolean]]


|p2= b: [[Boolean]]


|[[Boolean]] |= Return value
|s2= [[Boolean]] <nowiki>=</nowiki> a '''<nowiki>||</nowiki>''' b (''Only available since ArmA 2:OA v1.62.'') |= Syntax
|p21= a: [[Boolean]] - Test condition or variable that returns [[Boolean]]. |= Parameter 1
|p22= b: [[Code]] - Code that returns [[Boolean]]. It is not evaluated if '''a''' returns as [[true]]. |= Parameter 2
|r2= [[Boolean]] |= Return value
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|x1 = <code>if ((canMove tank1) '''<nowiki>||</nowiki>''' (canMove tank2)) then {hint "We can still move"}</code> |= Example 1
|x1= <code>[[if]] ((OBJ1) <nowiki>||</nowiki> (_enemycount == 0)) then {[[hint]] "you win !"}</code> |= Example 1
|x2= <code>[[if]] (([[count]] _array == 0) <nowiki>||</nowiki> {(_array [[select]] 0) != [[player]]}) then {[[hint]] "It works! Without lazy evaluation it would throw an error if array was empty."}</code> |= Example 2
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| [[or]], [[Operators]]  |= See also
| [[or]], [[and]], [[Operators]]  |= See also
 
|mp= no special considerations|=
}}
}}


Revision as of 10:59, 9 August 2012

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Description

Description:
Returns true only if one or both conditions are true. In case of the alternative syntax, lazy evaluation is used (if left operand is true, evaluation of the right side is skipped completely). Identical to: a or b
Multiplayer:
no special considerations
Groups:
Uncategorised

Syntax

Syntax:
Boolean = a || b
Parameters:
a: Boolean - Test condition or variable that returns Boolean.
b: Boolean - Test condition or variable that returns Boolean.
Return Value:
Boolean

Alternative Syntax

Syntax:
Boolean = a || b (Only available since ArmA 2:OA v1.62.)
Parameters:
a: Boolean - Test condition or variable that returns Boolean.
b: Code - Code that returns Boolean. It is not evaluated if a returns as true.
Return Value:
Boolean

Examples

Example 1:
if ((OBJ1) || (_enemycount == 0)) then {hint "you win !"}
Example 2:
if ((count _array == 0) || {(_array select 0) != player}) then {hint "It works! Without lazy evaluation it would throw an error if array was empty."}

Additional Information

See also:
orandOperators

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

Notes

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