Microsoft® JScript®
JScript Operators
 JScript Tutorial

JScript has a full range of operators, including arithmetic, logical, bitwise, and assignment operators. There are also a few miscellaneous operators.

Computational Logical Bitwise Assignment Miscellaneous
Description Symbol Description Symbol Description Symbol Description Symbol Description Symbol
Unary negation - Logical NOT ! Bitwise NOT ~ Assignment = delete delete
Increment ++ Less than < Bitwise Left Shift << Compound Assignment OP= typeof typeof
Decrement -- Greater than > Bitwise Right Shift >>     void void
Multiplication * Less than or equal to <= Unsigned Right Shift >>>        
Division / Greater than or equal to >= Bitwise AND &        
Modulus arithmetic % Equality == Bitwise XOR ^        
Addition + Inequality != Bitwise OR |        
Subtraction - Logical AND &&            
    Logical OR ||            
    Conditional (trinary) ?:            
    Comma ,            
    Identity ===            
    Nonidentity !==            

Operator Precedence
Operators in JScript are evaluated in a particular order. This order is known as the operator precedence. The following table lists the operators in highest to lowest precedence order. Operators in the same row are evaluated in left to right order.

. [] ()Field access, array indexing, and function calls
++ -- - ~ ! typeof new void deleteUnary operators, return data type, object creation, undefined values
* / %Multiplication, division, modulo division
+ - +Addition, subtraction, string concatenation
<< >> >>>Bit shifting
< <= > >=Less than, less than or equal to, greater than, greater than or equal to
== != === !==Equality, inequality, identity, nonidentity
&Bitwise AND
^Bitwise XOR
|Bitwise OR
&&Logical AND
||Logical OR
= OP=Assignment, assignment with operation
,Multiple evaluation

Parentheses are used to alter the order of evaluation. The expression within parentheses is fully evaluated before its value is used in the remainder of the statement.

An operator with higher precedence is evaluated before one with lower precedence. For example:

z = 78 * (96 + 3 + 45)
There are five operators in this expression: =, *, (), +, and +. According to precedence, they are evaluated in the following order: (), *, +, +, =.
  1. Evaluation of the expression within the parentheses is first: There are two addition operators, and they have the same precedence: 96 and 3 are added together and 45 is added to that total, resulting in a value of 144.
  2. Multiplication is next: 78 and 144 are multiplied, resulting in a value of 11232.
  3. Assignment is last: 11232 is assigned into z.