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Microsoft® JScript
|| Operator

See Also

Language Reference |

Used to perform a logical disjunction on two expressions.

result = expression1 || expression2

The || operator syntax has these parts:

Part Description
result Any variable.
expression1 Any expression.
expression2 Any expression.


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, please see the Logical Operators table.

The following are the 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.

© 1996 by Microsoft Corporation.
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