Learn JavaScript

Lesson 1 - Introduction To JavaScript

1.1 What Is JavaScript

1.2 Why JavaScript

Lesson 2 - Basic JavaScript Syntax

2.1 Variables And Data Types

2.2 Var, Let and Const

2.3 Basic Operators

2.4 Comments

Lesson 3 - Control Flow

3.1 Conditional Statements

3.2 Loops

Lesson 4 - Functions

4.1 Defining Functions

4.2 Function Parameters

4.3 Returning Values

4.4 Scope Of Variables

Lesson 5 - Basic Data Structures

5.1 Arrays

5.2 String

5.3 Numbers

5.4 Objects

Lesson 6 - Basic String Operations

6.1 Length

6.2 Upper Case

6.3 Lower Case

6.4 Split

6.5 Concat

Lesson 7 - Basic Array Operations

7.1 Length

7.2 Pop

7.3 Push

7.4 Concat

Lesson 8 - Exception Handling

8.1 What Are Exceptions

8.2 Handling Exceptions

8.3 Raising Exceptions

Lesson 9 - Packages

9.1 Overview

9.2 Installing and Using Packages

Lesson 10 - User Input

10.1 Reading User Input

Lesson 6 - Basic String Operations

6.1 Length

You can use the length property to find the length of a string.

let myStr = "Hello, world!";
console.log(myStr.length);