Course Content

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

JavaScript Data Structures

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.

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?

Everything was clear?

Section 5. Chapter 3

Course Content

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

3. Advanced Object Manipulation

4. Mastering Arrays

5. Advanced Array Operations

JavaScript Data Structures

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.

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?

Everything was clear?

Section 5. Chapter 3