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JavaScript Operators Reference


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


JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic between variables and/or values.

Given that y = 5, the table below explains the arithmetic operators:

Operator Description Example Result in y Result in x Try it
+ Addition x = y + 2 y = 5 x = 7 Try it »
- Subtraction x = y - 2 y = 5 x = 3 Try it »
* Multiplication x = y * 2 y = 5 x = 10 Try it »
/ Division x = y / 2 y = 5 x = 2.5 Try it »
% Modulus (division remainder) x = y % 2 y = 5 x = 1 Try it »
++ Increment x = ++y y = 6 x = 6 Try it »
x = y++ y = 6 x = 5 Try it »
-- Decrement x = --y y = 4 x = 4 Try it »
x = y-- y = 4 x = 5 Try it »

For a tutorial about arithmetic operators, read our JavaScript Operators Tutorial.


JavaScript Assignment Operators

Assignment operators are used to assign values to JavaScript variables.

Given that x = 10 and y = 5, the table below explains the assignment operators:

Operator Example Same As Result in x Try it
= x = y x = y x = 5 Try it »
+= x += y x = x + y x = 15 Try it »
-= x -= y x = x - y x = 5 Try it »
*= x *= y x = x * y x = 50 Try it »
/= x /= y x = x / y x = 2 Try it »
%= x %= y x = x % y x = 0 Try it »

For a tutorial about assignment operators, read our JavaScript Operators Tutorial.


JavaScript String Operators

The + operator, and the += operator can also be used to concatenate (add) strings.

Given that text1 = "Good ", text2 = "Morning", and text3 = "", the table below explains the operators:

Operator Example text1 text2 text3 Try it
+ text3 = text1 + text2 "Good " "Morning"  "Good Morning" Try it »
+= text1 += text2 "Good Morning" "Morning" "" Try it »


Comparison Operators

Comparison operators are used in logical statements to determine equality or difference between variables or values.

Given that x=5, the table below explains the comparison operators:

Operator Description Comparing Returns Try it
== equal to x == 8 false Try it »
x == 5 true Try it »
=== equal value and equal type x === "5" false Try it »
x === 5 true Try it »
!= not equal x != 8 true Try it »
!== not equal value or not equal type x !== "5" true Try it »
x !== 5 false Try it »
> greater than x > 8 false Try it »
< less than x < 8 true Try it »
>= greater than or equal to x >= 8 false Try it »
<= less than or equal to x <= 8 true Try it »

For a tutorial about comparison operators, read our JavaScript Comparisons Tutorial.


Conditional Operator

The conditional operator assigns a value to a variable based on a condition.

Syntax Example Try it
variablename = (condition) ? value1:value2 voteable = (age < 18) ? "Too young":"Old enough"; Try it »

Example explaied: If the variable "age" is a value below 18, the value of the variable "voteable" will be "Too young", otherwise the value of voteable will be "Old enough".


Logical Operators

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

Given that x=6 and y=3, the table below explains the 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

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 x = 5 & 1 0101 & 0001 0001  1
| OR x = 5 | 1 0101 | 0001 0101  5
~ NOT x = ~ 5  ~0101 1010  10
^ 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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