An operator is a symbol or sign used to specify an operation to be performed in a programming language.
Consider the mathematical operation 6 + 4 = 10
Here 6 and 5 are called operands and ‘+’ is called the operator.
JavaScript supports the following types of operators.
- Arithmetic Operators
- Assignment Operators
- Comparison Operators
- Conditional Operators
- Logical Operators
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic on numbers:
| Operator |
Description |
| + |
Addition |
| - |
Subtraction |
| * |
Multiplication |
| / |
Division |
| % |
Modulus (Division Remainder) |
| ++ |
Increment |
| -- |
Decrement |
In Javascript "+" sign is used for the string operation "concatenation" also.
JavaScript Assignment Operators
Assignment operators assign values to JavaScript variables.
| Operator |
Example |
Meaning |
| = | a = b | a = b |
| += | a += b | a = a + b |
| -= | a -= b | a = a - b |
| *= | a *= b | a = a * b |
| /= | a /= b | a = a / b |
| %= | a %= b | a = a % b |
In Javascript "+" sign is used for the string operation "concatenation" also.
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 |
| ? |
ernary 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 |
Eg: |
Meaning |
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 |
| << | left shift | 5 << 1 | 0101 << 1 | 1010 | 10 |
| >> | right shift | 5 >> 1 | 0101 >> 1 | 0010 | 2 |
| >>> | unsigned right shift | 5 >>> 1 | 0101 >>> 1 | 0010 | 2 |
