Conteúdo do Curso

Introduction to JavaScript

1. JavaScript Fundamentals

About JavaScript Understanding JavaScript Syntax Challenge: Console Output in JavaScript Using Comments to Document Code Challenge: Write a Single-Line Comment Challenge: Write a Multi-Line Comment

2. Variables and Data Types in JavaScript

Understanding Variables in JavaScript Challenge: Define the Variable Using const for Constants Exploring JavaScript Data Types Working with null in JavaScript Introduction to Arrays Array Methods and Manipulation Challenge: Perform Array Operations

3. Performing Operations in JavaScript

Understanding Assignment Operators Mathematical Operations in JavaScript Assignment Operators in JavaScript Increment and Decrement Operators Challenge: Variable Operations Practice Comparison Operators in JavaScript Logical Operators Explained Challenge: Compare Variables in JavaScript Concatenating Strings in JavaScript Challenge: Build Sentences with JavaScript

4. Controlling Program Flow with Conditional Statements

Mastering if Statements in JavaScript Using else for Alternative Outcomes Applying else if for Multiple Conditions Challenge: Determine Sizes with Conditionals

5. Looping Through Data in JavaScript

Understanding the while Loop in JavaScript Using the do while Loop for Iteration Challenge: Print Numbers from 5 to 9 Mastering the for Loop in JavaScript Challenge: Console Tigers with Loops Breaking Out of Loops with break Skipping Iterations with continue Challenge: Stop and Skip in Loops

6. Functions in JavaScript

What Are Functions in JavaScript?Defining Functions in JavaScript Challenge: Write a Function – My Name Using Function Arguments Effectively Returning Values from Functions Challenge: Create a Sum Function Course Summary & Next Steps

Working with null in JavaScript

In JavaScript, the null type represents "nothing" or the absence of data. It is used to indicate that a variable intentionally lacks a value. The following example demonstrates that the null type produces no output in the console:


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let variable = null

console.log("Some data 1")
console.log(variable)
console.log("Some data 2")

The example above demonstrates that the null type produces no output in the console.

Note

null is distinct from undefined;

We use null when we need to signify the absence of data or to pass the concept of "nothing" to another part of the program.

For instance, imagine you're working on a game where you need to describe a hero's data. In some cases, the hero's name might be unknown or missing. If the variable containing the hero's name doesn't exist, attempting to access it would result in an error. Using the null type allows you to indicate that the hero has no name and can be passed to another part of the program.

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Seção 2. Capítulo 5