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JavaScript Operators Reference


Complete Operators Reference

Revised July 2025

TypeCommon UseExample
AssignmentAssigns a value to a variablex = 5
ArithmeticPerforms arithmetic between variablesx = y + 2
StringConcatenates (adds) strings"Sun" + "shine"
ExponentiationRaises a variable to a powerx++
RemainderReturns the remainder from a divisionx++
IncrementIncrements a variablex++
DecrementDecrements a variablex--
ComparisonCompares variables(x == 5)
LogicalDetefines the logic between variables(x>0 || x>0)
BitwiseDoes binary operations on numbers(5 & 1)
SpreadSpreads an array into individual values(...numbers)
RelationalReturns if a variable is a propery "age" in person
typeofReturns the type of a variabletypeof "John"
instanceofReturns if a variable is an objectx instance of Array
deleteDeletes an object propertydelete car.color
voidRetuns undefinedvoid(0)

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:

Oper Example Same As Result 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 »
: x: 45 size.x = 45 x = 45 Try it »

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:

Oper Name Example Results Try it
+ Addition x = y + 2 y=5, x=7 Try it »
++ Increment x = y++ y=6, x=5 Try it »
++ Increment x = ++y y=6, x=6 Try it »
- Subtraction x = y - 2 y=5, x=3 Try it »
-- Decrement x = y-- y=4, x=5 Try it »
-- Decrement x = --y y=4, x=4 Try it »
* Multiplication x=y*2 y=5, x=10 Try it »
** Exponentiation x = y ** 2 y=5, x=25 Try it »
/ Division x = y / 2 y=5, x=2.5 Try it »
% Remainder x = y % 2 y=5, x=1 Try it »

Conditional (Ternary) Operator

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

Syntax Example Try it
(condition) ? x : y (z < 18) ? x : y Try it »

JavaScript String Operators

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

Given that t1 = "Good ", t2 = "Morning", and t3 = "", the table below explains the operators:

Oper Example t1 t2 t3 Try it
+ t3 = t1 + t2 "Good " "Morning"  "Good Morning" Try it »
+= t1 += t2 "Good Morning" "Morning" Try it »

Javascript 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:

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

JavaScript 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:

Oper Name Example Try it
&& AND (x < 10 && y > 1) is true Try it »
|| OR (x === 5 || y === 5) is false Try it »
! NOT !(x === y) is true Try it »

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.

Oper Name Example Same as Result Dec Try it
& AND x = 5 & 1 0101 & 0001 0001 1 Try it »
| OR x = 5 | 1 0101 | 0001 0101 5 Try it »
~ NOT x = ~ 5 ~0101 1010 10 Try it »
^ XOR x = 5 ^ 1 0101 ^ 0001 0100 4 Try it »
<< Left shift x = 5 << 1 0101 << 1 1010 10 Try it »
>> Right shift x = 5 >> 1 0101 >> 1 0010 2 Try it »
>>> Unsigned right x = 5 >>> 1 0101 >>> 1 0010 2 Try it »

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