Understanding 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 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 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?