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Logical AND Operator (&&) (JavaScript)

Performs a logical conjunction on two expressions.

result = expression1 && expression2

result

Any variable.

expression1

Any expression.

expression2

Any expression.

If expression1 evaluates to false, result is expression1. Otherwise, result is expression2. Consequently, the operation returns true if both operands are true; otherwise, it returns false.

JavaScript uses the following rules for converting non-Boolean values to Boolean values:

  • All objects are considered to be true.

  • Strings are considered to be false if they are empty.

  • null and undefined are considered to be false.

  • A Number is false if it is zero.

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.

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