What is a JavaScript Array?
Let’s start with the basics. A JavaScript array is a collection of data stored in a single variable. This data can be of any type, including strings, numbers, and even other arrays. Arrays in JavaScript are a way to group related data together, making it easier to work with.
Creating an Array
Now that we know what an array is, let’s create one. We can create an array in JavaScript by using square brackets and separating the values with commas. For example:
let myArray = [“apple”, “banana”, “orange”];
Accessing Array Elements
Now that we have created an array, let’s access its elements. We can access an element in an array by using its index. The index of the first element in an array is always 0, and we can access the elements of an array by using this index. For example:
console.log(myArray[0]); // Output: apple
Modifying Array Elements
Arrays in JavaScript are mutable, which means we can modify their elements. We can modify an element in an array by simply assigning a new value to it. For example:
myArray[1] = “kiwi”; console.log(myArray); // Output: [“apple”, “kiwi”, “orange”]
Array Methods
JavaScript provides us with a number of built-in methods for working with arrays. Let’s cover some of the most commonly used ones:
- push(): adds an element to the end of an array.
- pop(): removes the last element from an array.
- shift(): removes the first element from an array.
- unshift(): adds an element to the beginning of an array.
- splice(): removes or adds elements to an array at a specific index.
Iterating Over an Array
We can also iterate over an array to perform a specific action on each element. We can do this using a for loop, a for…of loop, or a forEach() method.
Conclusion:
And that’s it! We’ve covered what JavaScript arrays are, how to create and manipulate them, and some of the most commonly used array methods. Understanding arrays is an important part of being a JavaScript developer, so I hope this video has been helpful to you.