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Logical AND Operator (&&)

Visual Studio 2010

Performs a logical conjunction on two expressions.

Copy 
expression1 && expression2

expression1

Any expression.

expression2

Any expression.

If, and only if, both expressions evaluate to true, the result is true. If either expression evaluates to false, the result is false. The following table illustrates how the result is determined:

If expression1 coerces to

And expression2 coerces to

The result is

The result coerces to

true

true

expression2

true

true

false

expression2

false

false

true

expression1

false

false

false

expression1

false

JScript 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.

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