_ORELSE

_ORELSE is a boolean logical operator that performs short-circuiting inclusive logical disjunction on two expressions.

Syntax

result = firstvalue _ORELSE secondvalue

Description

• A logical operation is said to be short-circuiting if the compiled code can bypass the evaluation of one expression depending on the result of another expression.
• If the result of the first expression evaluated determines the final result of the operation, there is no need to evaluate the second expression, because it cannot change the final result.
• Short-circuiting can improve performance if the bypassed expression is complex, or if it involves procedure calls.
• If either or both expressions evaluate to true, result is true.

Availability

• 

  none

• 

  v3.13.0

• 
• 

  yes

• 

  yes

• 

  yes

Examples

Example: OR versus _ORELSE

PRINT "Trying _ORELSE" ' _ORELSE performs short-circuiting logical conjunction and hence for "strawberry", only isFruit() is called IF isFruit("strawberry") _ORELSE isRed("strawberry") _ORELSE isSeasonal("strawberry") THEN PRINT "Probably a strawberry." ELSE PRINT "Certainly not a strawberry." END IF PRINT PRINT "Trying OR" ' OR does not performs short-circuiting logical conjunction and hence all is***() functions are called IF isFruit("strawberry") OR isRed("strawberry") OR isSeasonal("strawberry") THEN PRINT "Probably a strawberry." ELSE PRINT "Certainly not a strawberry." END IF END FUNCTION isFruit%% (fruit AS STRING) PRINT "isFruit() called!" isFruit = (fruit = "strawberry") END FUNCTION FUNCTION isRed%% (fruit AS STRING) PRINT "isRed() called!" isRed = (fruit = "strawberry") END FUNCTION FUNCTION isSeasonal%% (fruit AS STRING) PRINT "isSeasonal() called!" isSeasonal = (fruit = "strawberry") END FUNCTION

Trying _ORELSE isFruit() called! Probably a strawberry. Trying OR isFruit() called! isRed() called! isSeasonal() called! Probably a strawberry.

See also

• Featured in our "Keyword of the Day" series
• _BIT, &B, _BYTE
• AND, XOR, OR
• AND (boolean), XOR (boolean), OR (boolean)
• _ANDALSO, _NEGATE
• Binary, Boolean
• Mathematical Operations

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