Introduction to JavaScript

Introduction to JavaScript

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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

Challenge: Console Output

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.

Challenge: Defining the Variable

Data Types Overview

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.

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.

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.

Challenge: Printing Numbers from 5 to 9

Challenge: Tigers

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.

What is a Function?

Challenge: My Name

Conteúdo do Curso

Introduction to JavaScript

Introduction to JavaScript

Logical Operations

Now, let's explore logical operations. Logical operations are used to manipulate and make decisions based on boolean values.

Logical Operators

There are three logical operators in JavaScript:

AND (&&);
OR (||);
NOT (!).

AND (&&)

The AND (&&) logical operator returns true only when both values it operates on are true. The result is false if any value is false.


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console.log(true && true);
console.log(true && false);
console.log(false && true);
console.log(false && false);

The AND (&&) operator requires all values to be true to return true.

OR (||)

The OR (||) logical operator returns true if at least one of the values is true. It returns false only when both values are false.


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console.log(true || true);
console.log(true || false);
console.log(false || true);
console.log(false || false);

The OR (||) operator returns false only when both values are false.

NOT (!)

The NOT (!) operator inverts the boolean value. It turns true into false and false into true.


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console.log(!true);
console.log(!false);

Using Logical Operators

Logical operators are often used to combine conditions. For example, to check if two values are greater than 4 or greater than 1, you can use the AND (&&) operator.


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let a = 5, b = 3;

console.log(a > 4 && b > 4);
console.log(a > 1 && b > 1);

Priority

Logical operations have a lower priority than comparison operations, which, in turn, have a lower priority than mathematical operations.

Note
Similar to other operations, you can use parentheses () to adjust the priority of execution.

1. What will be the output?

2. What will be the output?

3. What will be the output?

Tudo estava claro?

Seção 3. Capítulo 7

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