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Language reference

JavaScript reference

JavaScript Language Reference

JavaScript Reference

JavaScript Operators

Addition Assignment Operator (+=) (JavaScript)

Addition Operator (+) (JavaScript)

Assignment Operator (=) (JavaScript)

Bitwise AND Assignment Operator (&=) (JavaScript)

Bitwise AND Operator (&) (JavaScript)

Bitwise Left Shift Operator (<<) (JavaScript)

Bitwise NOT Operator (~) (JavaScript)

Bitwise OR Assignment Operator (|=) (JavaScript)

Bitwise OR Operator (|) (JavaScript)

Bitwise Right Shift Operator (>>) (JavaScript)

Bitwise XOR Assignment Operator (^=) (JavaScript)

Bitwise XOR Operator (^) (JavaScript)

Comma Operator (,) (JavaScript)

Comparison Operators (JavaScript)

Compound Assignment Operators (JavaScript)

Conditional (Ternary) Operator (?:) (JavaScript)

delete Operator (JavaScript)

Division Assignment Operator (/=) (JavaScript)

Division Operator (/) (JavaScript)

in Operator (JavaScript)

Increment (++) and Decrement (--) Operators (JavaScript)

instanceof Operator (JavaScript)

Left Shift Assignment Operator (<<=) (JavaScript)

Logical AND Operator (&&) (JavaScript)

Logical NOT Operator (!) (JavaScript)

Logical OR Operator (||) (JavaScript)

Modulus Assignment Operator (JavaScript)

Modulus Operator (JavaScript)

Multiplication Assignment Operator (*=) (JavaScript)

Multiplication Operator (*) (JavaScript)

new Operator (JavaScript)

Right Shift Assignment Operator (>>=) (JavaScript)

Subtraction Assignment Operator (-=) (JavaScript)

Subtraction Operator (-) (JavaScript)

typeof Operator (JavaScript)

Unsigned Right Shift Assignment Operator (>>>=) (JavaScript)

Unsigned Right Shift Operator (>>>) (JavaScript)

void Operator (JavaScript)

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Logical OR Operator (||) (JavaScript)

JavaScript - Internet Explorer 10

Performs a logical disjunction on two expressions.

result = expression1 || expression2

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

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.

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. Also supported in Windows Store apps. See Version Information.

Concepts

Operator Precedence (JavaScript)

Operator Summary (JavaScript)

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