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

Syntax

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.

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

Syntax

JavaScript follows a default syntax with parentheses, curly brackets, and semicolons.

Let's create a simple program and delve into its syntax. In JavaScript, you don't need to define a main function as required in languages like C, C++, Java, GoLang, etc. You can directly write your code:


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console.log("Hello, user!");

In the example above, we've crafted a program that uses the console.log() method to print Hello, user! to the console.

Now, let's break down the syntax:

To begin, we employ the console.log() method. This method serves the purpose of printing values in the console;
Following that, we place "Hello, user!" within this method, enclosed in parentheses ();
The quotes (" or ') serve as indicators to JavaScript, signifying that Hello, user! is plain text and not a function or any other program-related keyword;
Lastly, the semicolon (;) functions as the command terminator, marking the conclusion of a command.

A program comprises a series of commands. If you intend to print text multiple times, you can utilize the semicolon ; to signal the end of each command:


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console.log("Command 1");
console.log("Command 2");
console.log("Command 3");

In the example above, the semicolon ; serves as the separator for the three commands in our code:

The first command is console.log("Command 1") followed by ; (indicating the end of this command);
Subsequent commands are structured similarly.

1. What is the purpose of the `console.log()` method?

2. Why do we use quotes (" or ') around text like "Hello, user!"?

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Seção 1. Capítulo 2

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