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7.4.28 Logical OR Operator (||)

Used to perform a logical disjunction on two expressions.
 

Syntax

result = expression1 || expression2

Arguments

result
Any variable.
expression1
Any expression.
expression2
Any expression.

Remarks

If either or both expressions evaluate to True, result is True. The following table illustrates how result is determined:
 

If expression1 is And expression2 is The result is
True
 
True
 
True
 
True
 
False
 
True
 
False
 
True
 
True
 
False
 
False
 
False
 
For information on when a run-time error is generated by the && operator, see the Operator Behavior table.
 
JScript uses the following rules for converting non-Boolean values to Boolean values:
 

  • All objects are considered true.
  • Strings are considered false if and only if they are empty.
  • null and undefined are considered false.
  • Numbers are false if and only if they are 0.

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