JavaScript Data Structures

Course Content

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

find() Method

Let's explore the find() method, including its syntax and applications, with concrete examples to illustrate its functionality.

find()

While the filter() method sifts through an array to uncover all elements meeting a condition, the find() method is tailor-made for a singular mission – discovering and retrieving the first matching element. Here's a closer look at its syntax:

Let's unravel the critical characteristics of the find() method:

The original array remains unaltered;
It navigates through the array, scrutinizing each element;
The method halts upon locating the initial match, returning that specific element;
Without a matching element, the method returns undefined.

Find a Task by Order

In this example, the 'find()' method retrieves the task by the 'order' key.


              1234567891011
            
const tasks = [
  { order: 1, name: "Buy groceries" },
  { order: 2, name: "Walk the dog" },
  { order: 3, name: "Read a book" },
];

const firstTask = tasks.find((element) => element.order === 1);
console.log("First task:", firstTask.name); // Output: First task: Buy groceries

const secondTask = tasks.find((element) => element.order === 2);
console.log("Second task:", secondTask.name); // Output: Second task: Walk the dog

Everything was clear?

Thanks for your feedback!

Section 5. Chapter 5

some-alt