Logical OR Operator (||) (JavaScript)

1 minutes to read Contributors
  • Mike Jones
  • Saisang Cai

Performs a logical disjunction on two expressions.

Syntax


result = expression1 || expression2

Parameters

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

JavaScript 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.

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

See Also

Operator Precedence
Operator Summary (JavaScript)