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Basic operators
In JavaScript, operators are symbols that allow you to perform operations on values and variables.
1. Arithmetic Operators
These operators are used to perform mathematical operations:
| Operator | Description | Example | Result |
|---|---|---|---|
| + | Addition | 5 + 2 | 7 |
| - | Subtraction | 5 - 2 | 3 |
| * | Multiplication | 5 * 2 | 10 |
| / | Division | 5 / 2 | 2.5 |
| % | Modulus (Remainder) | 5 % 2 | 1 |
| ** | Exponentiation (ES6) | 5 ** 2 | 25 |
| ++ | Increment (Add 1) | let x = 5; x++ | 6 |
| -- | Decrement (Subtract 1) | let x = 5; x-- | 4 |
2. Assignment Operators
These operators assign values to variables:
| Operator | Example | Equivalent to |
|---|---|---|
| = | x = 5 | x = 5 |
| += | x += 5 | x = x + 5 |
| -= | x -= 5 | x = x - 5 |
| *= | x *= 5 | x = x * 5 |
| /= | x /= 5 | x = x / 5 |
| %= | x %= 5 | x = x % 5 |
| **= | x **= 2 | x = x ** 2 |
3. Comparison Operators
These operators compare two values and return a boolean (true or false):
| Operator | Description | Example | Result |
|---|---|---|---|
| == | Equal to | 5 == '5' | true |
| === | Strict equal to (type check) | 5 === '5' | false |
| != | Not equal to | 5 != '5' | false |
| !== | Strict not equal (type check) | 5 !== '5' | true |
| > | Greater than | 5 > 2 | true |
| < | Less than | 5 < 2 | false |
| >= | Greater than or equal to | 5 >= 5 | true |
| <= | Less than or equal to | 5 <= 2 | false |
4. Logical Operators
These operators are used to perform logical operations:
| Operator | Description | Example | Result |
|---|---|---|---|
| && | Logical AND | true && false | false |
| ` | ` | Logical OR | |
| ! | Logical NOT | !true | false |
These are the fundamental operators you’ll frequently encounter when writing JavaScript code. They allow you to manipulate and compare data efficiently.