JavaScript Operators

Assign values to variables and add them together:

EXAMPLE ❯


The assignment operator (=) assigns a value to a variable.

EXAMPLE ❯


The addition operator (+) adds numbers:

EXAMPLE ❯


The multiplication operator (*) multiplies numbers.

EXAMPLE ❯


JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic on numbers:

Operator Description
+ Addition
- Subtraction
* Multiplication
** Exponentiation (ES2016)
/ Division
% Modulus (Division Remainder)
++ Increment
-- Decrement

JavaScript Assignment Operators

Assignment operators assign values to JavaScript variables.

Operator Example Same As
= x = y x = y
+= x += y x = x + y
-= x -= y x = x - y
*= x *= y x = x * y
/= x /= y x = x / y
%= x %= y x = x % y
**= x **= y x = x ** yz

The addition assignment operator (+=) adds a value to a variable.

EXAMPLE ❯


JavaScript String Operators

The + operator can also be used to add (concatenate) strings.

When working with JavaScript strings sometimes you need to join two or more strings together into a single string. Joining multiple strings together is known as concatenation.

The concatenation operator (+) concatenates two or more string values together and return another string which is the union of the two operand strings.

EXAMPLE ❯


Adding Strings and Numbers

Adding two numbers, will return the sum, but adding a number and a string will return a string:

EXAMPLE ❯


JavaScript Comparison Operators

Operator Description
== equal to
=== equal value and equal type
!= not equal
!== not equal value or not equal type
> greater than
< less than
>= greater than or equal to
<= less than or equal to
? ternary operator

JavaScript Logical Operators

Operator Description
&& logical and
|| logical or
! logical not

JavaScript Type Operators

Operator Description
typeof Returns the type of a variable
instanceof Returns true if an object is an instance of an object type

JavaScript Bitwise Operators

Bit operators work on 32 bits numbers.

Any numeric operand in the operation is converted into a 32 bit number. The result is converted back to a JavaScript number.

Operator Description Example Same as Result Decimal
& AND 5 & 1 0101 & 0001 0001  1
| OR 5 | 1 0101 | 0001 0101  5
~ NOT ~ 5  ~0101 1010  10
^ XOR 5 ^ 1 0101 ^ 0001 0100  4
<< Zero fill left shift 5 << 1 0101 << 1 1010  10
>> Signed right shift 5 >> 1 0101 >> 1 0010   2
>>> Zero fill right shift 5 >>> 1 0101 >>> 1 0010   2