Conteúdo do Curso

JavaScript Data Structures

1. Introduction and Prerequisites

Introduction to JavaScript Data Structures Prerequisites for Learning JavaScript Data Structures What You'll Learn in This Course Tips for Success

2. Fundamentals of JavaScript Objects

Understanding Objects in JavaScript Creating Objects in JavaScript Working with Nested Object Properties Challenge: Create and Structure an Object Accessing Object Properties in JavaScript Challenge: Retrieve Object Property Values Managing Object Properties Challenge: Modify and Extend an Object Defining Object Methods Using Properties within Methods Challenge: Work with Object Methods Fundamentals of JavaScript Objects Sum-Up

3. Advanced Object Manipulation Techniques

Iterating Over Object Properties with the for...in Loop Challenge: Explore Object Properties with Iteration Using hasOwnProperty() to Check Object Properties Challenge: Object Property Iteration with hasOwnProperty()Cloning and Merging Objects with the Spread Operator Challenge: Combine Objects with the Spread Operator Destructuring Objects for Cleaner Code Challenge: Extract Data with Object Destructuring Advanced Object Manipulation Sum-Up

4. Mastering JavaScript Arrays

Understanding JavaScript Arrays Challenge: Access Array Elements Modifying Arrays and Accessing Elements Challenge: Modify Array Elements Iterating Over Arrays with the for Loop Challenge: Loop Through Arrays with for Using the for...of Loop for Array Iteration Challenge: Efficient Array Iteration with for...of Mastering JavaScript Arrays Sum-Up

5. Advanced Array Methods and Transformations

Transforming Arrays with the map() Method Challenge: Modify Array Elements Using map()Filtering Arrays with the filter() Method Challenge: Select Specific Data Using filter()Finding Elements in an Array with the find() Method Challenge: Search for Items Using find()Sorting Arrays with the sort() Method Challenge: Sort and Extract Data with sort()Advanced Array Methods and Transformations Sum-Up Course Summary

Understanding JavaScript Arrays

Arrays are versatile data structures used to store and manipulate collections of values. They are commonly used for managing lists of some items. Here, we will explore the creation of arrays and how to access their elements.

Creating Arrays

We can create an array using square brackets [], known as array literals. Commas should separate elements within the array.

Here, the sport array contains three elements: "basketball", "hockey", and "cricket".

Accessing Array Elements

We can access specific elements within an array by using square brackets with the element's index. Array indices start at 0, meaning the first element has an index of 0, the second element has an index of 1, and so on.


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const motorcycleBrands = ["Harley-Davidson", "Honda", "Kawasaki", "Suzuki"];

console.log(motorcycleBrands[0]); // Output: Harley-Davidson
console.log(motorcycleBrands[1]); // Output: Honda
console.log(motorcycleBrands[2]); // Output: Kawasaki
console.log(motorcycleBrands[3]); // Output: Suzuki

In this example, we access the elements of the motorcycleBrands array using their indices.

The first element is accessed with motorcycleBrands[0];
The second with motorcycleBrands[1];
The third with motorcycleBrands[2];
The forth with motorcycleBrands[3].

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Seção 4. Capítulo 1

JavaScript Data Structures

Understanding JavaScript Arrays

Creating Arrays

Accessing Array Elements

1. How do we create an array in JavaScript?

2. Which of the following statements correctly defines an array with three elements: "apple," "banana," and "cherry"?

3. What is the index of the first element in an array?

4. In the example below, how can we access the second element (`"Laptop"`) of the `products` array?

5. What will be the output in the code below?

JavaScript Data Structures

Understanding JavaScript Arrays

Creating Arrays

Accessing Array Elements

1. How do we create an array in JavaScript?

2. Which of the following statements correctly defines an array with three elements: "apple," "banana," and "cherry"?

3. What is the index of the first element in an array?

4. In the example below, how can we access the second element ("Laptop") of the products array?

5. What will be the output in the code below?

4. In the example below, how can we access the second element (`"Laptop"`) of the `products` array?