Introduction to JavaScript

1. Basic Concepts

Our first section will introduce you to JavaScript and explore its syntax. This initial step will give you a fundamental understanding of JavaScript's syntax, setting the stage for more in-depth learning in subsequent sections.

About JavaScript

Syntax

Challenge: Console Output

Comments

Challenge: Single-line Comment

Challenge: Multi-line Comment

2. Variables and Data Types

We'll dive into the essential data types that JavaScript operates with. We'll begin by distinguishing between literals and variables and then explore the diverse range of data types used in JavaScript. This knowledge will form a solid foundation for your journey into JavaScript.

Variables

Challenge: Defining the Variable

Challenge: Array Operations

3. Basic Operations

We're acquainted with the various data types. It's time to roll up our sleeves and learn how to manipulate them. In this third section, we'll explore the operations that can be performed with each data type, equipping you with practical skills to work effectively with JavaScript's data structures.

Assignment

Mathematical Operations

Operations with Assignment

Increment and Decrement

Challenge: Variable Operations

Comparison Operations

Logical Operations

Challenge: Comparing Variables

String Concatenation

Challenge: Sentence Building

4. Conditional Statements

Delve into the art of controlling the flow of execution in JavaScript. It's a powerful skill that enables us to instruct the interpreter precisely on how to behave under various conditions. You'll gain the ability to orchestrate your code's behavior.

else

else if

Challenge: Determining Size

5. Loops

Uncover the code optimization through the use of loops. Loops allow us to streamline our code by performing repetitive actions efficiently. We'll delve into JavaScript's different types of loops and discover how to wield their power effectively.

while

do while

Challenge: Printing Numbers from 5 to 9

Challenge: Stopping and Skipping

6. Functions

Unlock the potential of functions as essential tools for crafting simple yet powerful programs. You'll master creating and utilizing functions, empowering you to simplify your coding endeavors and enhance your problem-solving skills.

Conteúdo do Curso

Introduction to JavaScript

while

Loop Types

Loops are structures that repeatedly execute a code block while a specific condition is true. In JavaScript, there are three types of loops:

while;
do-while;
for.

Let's explore each of them in detail.

while Loop

The while loop is the simplest type of loop. It continues to execute a code block as long as the specified condition remains true.

To create a while loop, use the while keyword followed by a condition in parentheses and enclose the code block in curly braces. The syntax is similar to that of an if statement:

Here's an example:


              123456
            
let a = 5;

while (a <= 10) {
  console.log("a =", a);
  a++;
}

In this example, the while loop's code block executes six times:

Initially, the variable a is set to 5;
The loop condition is a <= 10, which is true, so the code block is executed;
After each execution, the variable a is incremented by 1;
The loop continues to execute as long as the condition remains true.

Note
The while loop checks the condition before executing the code block. If the condition is initially false, the code block will not be executed.

Note
Be cautious with the condition! If the condition always evaluates to true, the loop will never break, resulting in an infinite loop, which can cause your program to hang or become unresponsive.

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Seção 5. Capítulo 1