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.

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

return

Conteúdo do Curso

Introduction to JavaScript

Introduction to JavaScript

return

The primary purpose of a function is to return a value.

The function's space is deleted after its execution, and you rarely output information directly from the function to the console.

The return keyword is used to perform the value return operation, and it signifies the end of the function's execution:


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function add(a, b) {
  return a + b;
}

let sum = add(25, 30);

console.log("sum =", sum);

In the example above, you can see that the function call (add(25, 30)) is replaced by the value 55 (25 + 30) after the return keyword.

Note

The function completes its execution and returns a value at the point of call, and the function's space is cleared.

It's also essential to understand that the return keyword terminates the execution of the function. Any code after the return statement will not be executed:


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function add(a, b) {
  return a + b;
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
  console.log("Two numbers added");
}

let numb = add(25, 12);

console.log("numb =", numb);

The console.log() statements after the return statement were not executed.

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Seção 6. Capítulo 5

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