JavaScript Operators

JavaScript has a full range of operators, including arithmetic, logical, bitwise, assignment, as well as some miscellaneous operators. For explanations and examples, see the topics on specific operators.

Computational Operators

Logical Operators

Bitwise Operators

Assignment Operators

Description Symbol
Assignment =
Compound Assignment OP= (such as += and &=)

Miscellaneous Operators

Description Symbol
delete delete
typeof typeof
void void
instanceof instanceof
new new
in in

Equality and Strict Equality

The difference between == (equality) and === (strict equality) is that the equality operator will coerce values of different types before checking for equality. For example, comparing the string "1" with the number 1 will compare as true. The strict equality operator, on the other hand, will not coerce values to different types, and so the string "1" will not compare as equal to the number 1.

Primitive strings, numbers, and Booleans are compared by value. If they have the same value, they are equal. Objects (including ArrayFunctionStringNumberBooleanErrorDate and RegExp objects) compare by reference. Even if two variables of these types have the same value, they are equal only if they refer to exactly the same object.

Learn more about JavaScript Operator Precedence
JavaScript - Operators

// Two strings with the same value.

var string1 ="Hello";

var string2 ="Hello";


// Two String objects with the same value.

var StringObject1 =newString(string1);

var StringObject2 =newString(string2);


if (string1 == string2)

    document.write ( "string1 is equal to string2 <br/>");


if (StringObject1 != StringObject2)

    document.write ( "StringObject1 is not equal to StringObject2 <br/>" );


// To compare the values of String objects, use the toString() or valueOf() methods.

if (StringObject1.valueOf() == StringObject2.valueOf())

    document.write ( "The value of StringObject1 is equal to the value of StringObject2" );



// string1 is equal to string2

// StringObject1 is not equal to StringObject2

// The value of StringObject1 is equal to the value of StringObject2 

Learn more about JavaScript Operator Program Flow

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JS JavaScript: Bitwise Operators

Bitwise operators will handle their operands as a sequence of 32 bits (zeroes and ones), and not like decimal, hexadecimal, or octal numbers. For example, the decimal number nine has a binary representation of 1001. Bitwise operators perform their operation....

JS JavaScript: break

The break statement terminates a current loop or a switch statement.

The continue statement "jumps over" one iteration in the current loop.

JS JavaScript: Let

Let is a keyword that is used to declare a variable.

You should use let instead of var when declaring a variable.

One of the most important things is that you should try to keep things simple!<....

JS JavaScript: Comments

JavaScript comments can be used to to explain and make the code more readable. JavaScript comments can also prevent execution of code.

It is possible to comment code as a single-line comment or as a multi-line comment.


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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W3Schools is a great education Web Site for learning web technologies. On W3Schools you may find well organized basic to advanced tutorials and references.

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