Introduction to JavaScript

Introduction to JavaScript

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1. Basic Concepts

Discover the fundamentals of JavaScript, including its purpose and syntax. Learn how to work with the console for output and use comments to organize and document your code. These foundational skills will prepare you for a deeper exploration of JavaScript's capabilities.

About JavaScript

Challenge: Console Output

Challenge: Single-line Comment

Challenge: Multi-line Comment

2. Variables and Data Types

Explore the building blocks of JavaScript by distinguishing between literals and variables. Understand the core data types, including `null` and arrays, and learn how to manipulate them using array methods.

Challenge: Defining the Variable

Data Types Overview

Challenge: Array Operations

3. Basic Operations

Learn how to manipulate JavaScript's data types through essential operations. Master assignment, mathematical operations, incrementing and decrementing, comparisons, logical operations, and string concatenation.

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

Discover how to control the flow of your programs with conditional statements. Master `if`, `else`, and `else if` to instruct JavaScript on making decisions and executing code based on different conditions.

Challenge: Determining Size

5. Loops

Streamline your code by mastering JavaScript's looping structures. Explore `while`, `do while`, and `for` loops, and learn how to control their behavior using `break` and `continue`. Unlock the power of loops to perform repetitive tasks efficiently.

while

Challenge: Printing Numbers from 5 to 9

Challenge: Tigers

Challenge: Stopping and Skipping

6. Functions

Discover the power of functions in JavaScript. Learn how to define functions, work with arguments, and use the `return` statement to create reusable and efficient code. Mastering functions will enhance your ability to write clean and modular programs.

What is a Function?

Challenge: My Name

Conteúdo do Curso

Introduction to JavaScript

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

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