Course:
JavaScript Basics
Basic Operators and Expressions
Operators are symbols that perform operations on variables and values. In this lesson, we’ll cover the basic operators and expressions used in JavaScript.
1. Arithmetic Operators:
+), subtraction (-), multiplication (*), division (/), and modulus (%).Example Code:
let x = 10;
let y = 5;
console.log('Addition:', x + y); // Output: 15
console.log('Subtraction:', x - y); // Output: 5
console.log('Multiplication:', x * y); // Output: 50
console.log('Division:', x / y); // Output: 2
console.log('Modulus:', x % y); // Output: 0
2. Assignment Operators:
=, +=, -=, *=, /=, %=.Example Code:
let a = 10;
a += 5; // a = a + 5
console.log('a after += 5:', a); // Output: 15
a -= 3; // a = a - 3
console.log('a after -= 3:', a); // Output: 12
a *= 2; // a = a * 2
console.log('a after *= 2:', a); // Output: 24
a /= 4; // a = a / 4
console.log('a after /= 4:', a); // Output: 6
a %= 2; // a = a % 2
console.log('a after %= 2:', a); // Output: 0
3. Comparison Operators:
==, ===, !=, !==, >, <, >=, <=.Example Code:
let b = 10;
let c = '10';
console.log('b == c:', b == c); // Output: true (loose equality)
console.log('b === c:', b === c); // Output: false (strict equality)
console.log('b != c:', b != c); // Output: false
console.log('b !== c:', b !== c); // Output: true
console.log('b > 5:', b > 5); // Output: true
console.log('b < 5:', b < 5); // Output: false
console.log('b >= 10:', b >= 10); // Output: true
console.log('b <= 10:', b <= 10); // Output: true
4. Logical Operators:
&& (AND), || (OR), ! (NOT).Example Code:
let d = true;
let e = false;
console.log('d && e:', d && e); // Output: false
console.log('d || e:', d || e); // Output: true
console.log('!d:', !d); // Output: false
console.log('!e:', !e); // Output: true
5. String Operators:
+ operator.Example Code:
let firstName = 'John';
let lastName = 'Doe';
let fullName = firstName + ' ' + lastName;
console.log('Full Name:', fullName); // Output: John Doe
Conclusion: Understanding and using basic operators and expressions in JavaScript is essential for performing calculations, assigning values, comparing data, and controlling logic flow. Practice these concepts to build a strong foundation in JavaScript programming.