JavaScript Data Structures

JavaScript Data Structures

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1. Introduction and Prerequisites

Get a clear roadmap of what's to come, understand the prerequisites, and learn valuable tips to set you up for success as you delve into objects, arrays, and essential programming concepts.

Introduction to the Course

Prerequisites for the Course

What Will Be Covered

Tips for Success

2. Objects Fundamentals

Explore the core concepts of JavaScript objects. This section covers the fundamentals of object creation, property management, and method implementation.

Understanding Objects

Object Creation

Nested Properties

Challenge: Creating an Object

Accessing Object Properties

Challenge: Accessing Object Properties

Working with Properties

Challenge: Modifying and Extending Object

Properties in Methods

Challenge: Working with Object Methods

Object Fundamentals Sum Up

3. Advanced Object Manipulation

Dive into advanced techniques for working with JavaScript objects. This section delves into various strategies to efficiently manipulate and interact with objects.

Object Iteration with for...in Loop

Challenge: Object Property Explorer

Method hasOwnProperty()

Challenge: hasOwnProperty() for Object Property Iteration

Spread Operator

Challenge: Merging Objects and Adding Properties

Object Destructuring

Challenge: Destructuring

Advanced Object Manipulation Sum Up

4. Mastering Arrays

Embark on a journey into the JavaScript arrays. This section provides a strong foundation for creating arrays, managing elements, and executing basic array operations.

Understanding Arrays

Challenge: Array Element Accessor

Working with Array Elements

Challenge: Array Element Modifier

Challenge: Array Element Iteration

Challenge: Iteration with for...of

Mastering Arrays Sum Up

5. Advanced Array Operations

Master the advanced array manipulation skills, covering various techniques and methods for handling arrays effectively in multiple scenarios.

Challenge: Array Element Transformation

filter() Method

Challenge: Filtering Students by Exam Scores

Challenge: Discovering Featured Products

Challenge: Sorting and Extracting Properties

Advanced Array Operations Sum Up

Conteúdo do Curso

JavaScript Data Structures

JavaScript Data Structures

1. Introduction and Prerequisites

Introduction to the Course Prerequisites for the Course What Will Be Covered Tips for Success

2. Objects Fundamentals

Understanding Objects Object Creation Nested Properties Challenge: Creating an Object Accessing Object Properties Challenge: Accessing Object Properties Working with Properties Challenge: Modifying and Extending Object Object Methods Properties in Methods Challenge: Working with Object Methods Object Fundamentals Sum Up

3. Advanced Object Manipulation

Object Iteration with for...in Loop Challenge: Object Property Explorer Method hasOwnProperty()Challenge: hasOwnProperty() for Object Property Iteration Spread Operator Challenge: Merging Objects and Adding Properties Object Destructuring Challenge: Destructuring Advanced Object Manipulation Sum Up

4. Mastering Arrays

Understanding Arrays Challenge: Array Element Accessor Working with Array Elements Challenge: Array Element Modifier for Loop Challenge: Array Element Iteration for...of Loop Challenge: Iteration with for...of Mastering Arrays Sum Up

5. Advanced Array Operations

map() Method Challenge: Array Element Transformation filter() Method Challenge: Filtering Students by Exam Scores find() Method Challenge: Discovering Featured Products sort() Method Challenge: Sorting and Extracting Properties Advanced Array Operations Sum Up Course Sum Up

filter() Method

This chapter delves into the intricacies of the filter() method, elucidating its syntax, applications, and how it facilitates the creation of refined arrays.

filter()

The filter() method selects elements that meet a particular condition. Let's decipher the syntax:

Here's what we need to know about the filter() method:

It does not alter the original array;
It iterates over the original array element by element;
It returns a new array;
Elements are added to the new array if they satisfy the callback condition;
If the callback returns true, the element is included; otherwise, it is omitted.

Examples

The true prowess of the filter() method becomes apparent when applied to diverse scenarios. Let's delve into some illustrative examples:

Example 1: Filtering Odd Numbers

In this example, the filter() method creates an array (oddNumbers) comprising only odd numbers from the original array.


              123456
            
const numbers = [15, 22, 37, 41, 58, 67, 72];

const oddNumbers = numbers.filter((number) => {
  return number % 2 !== 0;
});
console.log(oddNumbers); // Output: 15, 37, 41, 67

Example 2: Filtering Products by Price Range

Here, the filter() method is utilized to extract products with prices below $500, creating a new array (affordableProducts).

1. What does the `filter()` method do?

2. What is a key characteristic of the `filter()` method?

3. In the example below, what should be the condition so that the `numbersGreaterThan20` array would contain numbers greater than 20?

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Seção 5. Capítulo 3

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