JavaScript Operator Precedence

With operator precedence we describe the order in which operations are executed when expressions are evaluated. The operations with a higher precedence will run before the operations with a lower precedence. For example, multiplication is performed before addition.

JavaScript Operators

Let's take a look at the table lists that contains the JavaScript operators. In the list they are ordered from highest to lowest precedence. The operators that has the same precedence in the list are evaluated left to right.

Operator Description
. Field access, array indexing, function calls, and expression grouping
++ -- - ~ ! delete new typeof void Unary operators, return data type, object creation, undefined values
* / % Multiplication, division, modulo division
+ - + Addition, subtraction, string concatenation
<< >> >>> Bit shifting
< <= > >= instanceof Less than, less than or equal, greater than, greater than or equal, instanceof
== != === !== Equality, inequality, strict equality, and strict inequality
& Bitwise AND
^ Bitwise XOR
| Bitwise OR
&& Logical AND
|| Logical OR
?: Conditional
OP= Assignment, assignment with operation (such as += and &=)
, Multiple evaluation

To alter the order of the evalutation we use parentheses determined by operator precedence. So an expression within parentheses is always evaluated fully before we use its value in the reminder of the expression.

Learn more about JavaScript Operators
Practical example
JavaScript - Precedence Example

var x= 5 * 6 + 46;
document.write( "<br/>" );
x= 5 * (6 + 3);

Another example
JavaScript - Precedence Example

var x = 10;
if (5 == x / 2 && (2 + 2 * x).toString() === "22" ) 
// Result: true
// Result: // 76 // 45

Learn more about JavaScript Operator Program Flow

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JS JavaScript: Booleans

Boolean is a primitive data type in JavaScript. Boolean can have only two values, true or false. It is useful in controlling program flow using conditional statements like if..else, switch, while, do..while.

JS JavaScript: Strings

JavaScript strings are used for storing and manipulating text.
A string can be any text inside double or single quotes.

Strings can contain letters, numbers, symbols, punctuation, and even emoji.

A JavaScript string stores a series of characters like "Jonny ....

JS JavaScript: Variables

A variable contains a value. When you use the variable, you refer to the data it represents. You use variables to store, retrieve and manipulate values in your code.


JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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