JavaScript Operators

JavaScript operators are used to assign values, compare values, perform arithmetic operations, etc.

JavaScript Arithmetic Operators

Arithmetic operators are used to perform operations on two variables or values.

Assignmenty = 5, the following table explains the use of arithmetic operators:

Operator Description Example y value x value Online Example
+ Addition x = y + 2 y = 5 x = 7 Example »
- Subtraction x = y - 2 y = 5 x = 3 Example »
* Multiplication x = y * 2 y = 5 x = 10 Example »
/ Division x = y / 2 y = 5 x = 2.5 Example »
% Modulus x = y % 2 y = 5 x = 1 Example »
++ Increment x = ++y y = 6 x = 6 Example »
x = y++ y = 6 x = 5 Example »
-- Decrement x = --y y = 4 x = 4 Example »
x = y-- y = 4 x = 5 Example »

About arithmetic operators, you can read ourJavaScript Operators Tutorial。

JavaScript Assignment Operators

Assignment operators are used to assign values to JavaScript variables.

Givenx=10 and y=5, the following table explains the assignment operators:

Operator Example Example x value Online Example
= x = y x = y x = 5 Example »
+= x += y x = x + y x = 15 Example »
-= x -= y x = x - y x = 5 Example »
*= x *= y x = x * y x = 50 Example »
/= x /= y x = x / y x = 2 Example »
%= x %= y x = x % y x = 0 Example »

About assignment operators, you can read ourJavaScript Operators Tutorial。

JavaScript String Operators

The + operator and the += operator can be used to concatenate strings.

Giventext1 = "Good ", text2 = "Morning", and text3 = "", the following table explains the use of string operators:

Operator Example text1 text2 text3 Online Example
+ text3 = text1 + text2 "Good " "Morning"  "Good Morning" Example »
+= text1 += text2 "Good Morning" "Morning" "" Example »

Comparison Operators

Comparison operators are used in logical statements to determine whether two given values or variables are equal.

Givenx=5, the following table shows the use of comparison operators:

Operator Description Comparison Result Online Example
== Equal to x == 8 false Example »
x == 5 true Example »
=== Equal value and equal type (strictly equal) x === "5" false Example »
x === 5 true Example »
!= Not equal x != 8 true Example »
!== Not equal value or type (strictly not equal) x !== "5" true Example »
x !== 5 false Example »
> Greater than x > 8 false Example »
< Less than x < 8 true Example »
>= Greater than or equal to x >= 8 false Example »
<= Less than or equal to x <= 8 true Example »

About comparison operators, you can read ourJavaScript Comparison Operators Tutorial。

Conditional Operator

The conditional operator is used to assign a value based on a condition.

Givenx=6 and y=3, the following table demonstrates the operation of the conditional operator:

Syntax Example Online Example
Variable= (Condition) ?Value 1:Value 2 voteable = (age < 18) ? "Too young to vote":"Old enough"; Example »

Logical Operators

Logical operators are used to determine the logical relationship between variables or values.

Givenx=6 and y=3, the following examples demonstrate the use of logical operators:

Operator Description Example
&& and (x < 10 && y > 1) is true
|| or (x == 5 || y == 5) is false
! not !(x == y) is true

JavaScript Bitwise Operators

Bitwise operators work on 32-bit numbers. Any numeric operand is converted to 32 bits. The result is converted to a JavaScript number.


Operator Description Example Similar to Result Decimal
& AND x = 5 & 1 0101 & 0001 0001  1
| OR x = 5 | 1 0101 | 0001 0101  5
~ NOT x = ~ 5  ~0101 1010  -6
^ XOR x = 5 ^ 1 0101 ^ 0001 0100  4
<< Left shift x = 5 << 1 0101 << 1 1010  10
>> Right shift x = 5 >> 1 0101 >> 1 0010 2
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