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

Modifying Arrays and Accessing Elements

Let's explore how to

Modify array elements;
Find the length of an array;
Access the last element and delve deeper into the concept of indexing.

Modifying Array Elements

Array elements can be changed by accessing them through their index and assigning a new value.


              12345
            
const weekdays = ["Monday", "Tuesday", "Wednesday"];
weekdays[0] = "Lunes";
weekdays[1] = "Martes";

console.log(weekdays); // Output: Lunes, Martes, Wednesday

Here, we modify the first two elements of the weekdays array to their Spanish translations.

Array Length

The length property of an array represents the number of elements it contains. This property is dynamic and automatically adjusts when elements are added or removed.


              123
            
const mountains = ["Everest", "K2", "Kangchenjunga", "Lhotse"];

console.log(mountains.length); // Output: 4

In this example, the mountains array contains four elements, and mountains.length returns 4.

Finding the Last Element

To retrieve the value of the last element in an array, we can calculate its index using the array's length. The index of the last element is always array.length - 1.


              1234
            
const vehicles = ["car", "bike", "bus", "train"];
const lastIndex = vehicles.length - 1;

console.log(vehicles[lastIndex]); // Output: train

In this case, lastIndex is computed as 3, which is the index of the last element, and we access the last element using vehicles[lastIndex].

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Seção 4. Capítulo 3

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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

3. Advanced Object Manipulation Techniques

4. Mastering JavaScript Arrays

5. Advanced Array Methods and Transformations

Modifying Arrays and Accessing Elements

Let's explore how to

Modify array elements;
Find the length of an array;
Access the last element and delve deeper into the concept of indexing.

Modifying Array Elements

Array elements can be changed by accessing them through their index and assigning a new value.


              12345
            
const weekdays = ["Monday", "Tuesday", "Wednesday"];
weekdays[0] = "Lunes";
weekdays[1] = "Martes";

console.log(weekdays); // Output: Lunes, Martes, Wednesday

Here, we modify the first two elements of the weekdays array to their Spanish translations.

Array Length

The length property of an array represents the number of elements it contains. This property is dynamic and automatically adjusts when elements are added or removed.


              123
            
const mountains = ["Everest", "K2", "Kangchenjunga", "Lhotse"];

console.log(mountains.length); // Output: 4

In this example, the mountains array contains four elements, and mountains.length returns 4.

Finding the Last Element

To retrieve the value of the last element in an array, we can calculate its index using the array's length. The index of the last element is always array.length - 1.


              1234
            
const vehicles = ["car", "bike", "bus", "train"];
const lastIndex = vehicles.length - 1;

console.log(vehicles[lastIndex]); // Output: train

In this case, lastIndex is computed as 3, which is the index of the last element, and we access the last element using vehicles[lastIndex].

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 4. Capítulo 3

JavaScript Data Structures

Modifying Arrays and Accessing Elements

Modifying Array Elements

Array Length

Finding the Last Element

1. How can we modify an array element?

2. What is the purpose of the `length` property of an array?

3. In the example provided below, what is the new value of the first element in the `movies` array after the modification?

4. How can we access the last element in the `cartoons` array?

5. What is the value of the `item` in the example provided below?

JavaScript Data Structures

Modifying Arrays and Accessing Elements

Modifying Array Elements

Array Length

Finding the Last Element

1. How can we modify an array element?

2. What is the purpose of the `length` property of an array?

3. In the example provided below, what is the new value of the first element in the `movies` array after the modification?

4. How can we access the last element in the `cartoons` array?

5. What is the value of the `item` in the example provided below?

JavaScript Data Structures

Modifying Arrays and Accessing Elements

Modifying Array Elements

Array Length

Finding the Last Element

1. How can we modify an array element?

2. What is the purpose of the length property of an array?

3. In the example provided below, what is the new value of the first element in the movies array after the modification?

4. How can we access the last element in the cartoons array?

5. What is the value of the item in the example provided below?

JavaScript Data Structures

Modifying Arrays and Accessing Elements

Modifying Array Elements

Array Length

Finding the Last Element

1. How can we modify an array element?

2. What is the purpose of the length property of an array?

3. In the example provided below, what is the new value of the first element in the movies array after the modification?

4. How can we access the last element in the cartoons array?

5. What is the value of the item in the example provided below?

2. What is the purpose of the `length` property of an array?

3. In the example provided below, what is the new value of the first element in the `movies` array after the modification?

4. How can we access the last element in the `cartoons` array?

5. What is the value of the `item` in the example provided below?

2. What is the purpose of the `length` property of an array?

3. In the example provided below, what is the new value of the first element in the `movies` array after the modification?

4. How can we access the last element in the `cartoons` array?

5. What is the value of the `item` in the example provided below?