|| Operator

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Description

Used to perform a logical disjunction on two expressions.

Syntax

result = expression1 || expression2

The || operator syntax has these parts:

Part	Description
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

As for all logical operators, JScript will generate runtime errors for every case in the table below where an E is indicated:

	obj	as	ns	num	bool	undef	null
obj	N	E	N	N	N	E	E
as	E	E	E	E	E	E	E
ns	N	E	N	N	N	E	E
num	N	E	N	N	N	E	E
bool	N	E	N	N	N	E	E
undef	E	E	E	E	E	E	E
null	E	E	E	E	E	E	E

obj = Object, as = Alphanumeric String, ns = Numeric String, num = Number, bool = Boolean, undef = Undefined, null = Null value.

The following are the rules for converting non-boolean values to boolean:

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