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Logical Operators (C# and JavaScript Cross Reference Guide)

By Mike Prestwood

C# versus JavaScript: A side by side comparison between C# and JavaScript.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Logical Operators

[Other Languages]

Languages Focus

Logical operators perform conditional and, or, and not operations. Some languages support both binary logical operators that link two and unary logical operators negate (make opposite) the truth value of its argument. Finally, some languages short circuit logic. For example, with this or that, if this is an expression returning true, then that is never executed.

C#:

Same as C++ and Java. C# logical operators:

&	and, as in this and that	No Short Circuit
&&	and, as in this and that	short circuits
\|	or, as in this or that	No Short Circuit
\|\|	or, as in this or that	short circuits
!	Not, as in Not This
^	either or, as in this or that but not both

Syntax Example:

//Given expressions a, b, c, and d:

if !((a && b) && (c || d))

  //Do something.

JavaScript:

JavaScript logical operators:

&&	and, as in this and that
\|\|	or, as in this or that
!	Not, as in Not This

JavaScript always short circuits. Given the expression this || that, if this evaluates to true, then that is never executed.

Syntax Example:

//Given expressions a, b, c, and d:

if !((a && b) && (c || d)) {

  //Do something.