Operators in JavaScript
Introduction Link to heading
Operators are symbols or keywords used to perform actions on one or more values (operands) in JavaScript.
Types of operators Link to heading
-
Binary operators: They operate on two operands:
- Arithmetic:
+,-,*,/,% - Relational:
<,>,<=,>=,==,=== - Logical:
&&,||,! - Concatenation:
+
- Arithmetic:
Examples Link to heading
- Arithmetic:
3 + 2; // Sum: 5
50 - 10; // Subtraction: 40
10 \* 20; // Multiplication: 200
20/2; // Division: 10
20% 2; // Rest: 0
- Relational:
3 == "3"; // Value equality: true
3 === "3"; // Equality of value and type: false
5 < 3; // Less than: false
5 > 3; // Greater than: true
5 <= 6; // Less than or equal to: true
5 >= 6; // Greater than or equal to: false
- Logical:
true && true; // Both are true: true
true || false; // At least one is true: true
!false; // Negation: true
- Concatenation:
"Hello " + "World"; // String concatenation: "Hello World"
-
Unary operators: They operate on a single operand.
- Negation:
! - Increment/Decrement:
++,--
- Negation:
Examples: Link to heading
- Denial:
!false; // Negation: true
- Increment/Decrement:
var a = 1;
a++; // Increase to 2
age--; // Decrease age by 1
Advanced operators Link to heading
- Ternary operator:
var age = 18;
var message = age >= 18 ? "adult" : "Minor";
console.log(message); // "adult"
- Short Circuit Operator:
var a = 1;
var b = 2;
// B is only evaluated if a is truthy
a && b; // true
// b is evaluated even if a is falsy
a || b; // 2
Keep learning about operators to write more expressive and efficient JavaScript code!