JavaScript

In JavaScript, you can divide a program into separate files to improve organization and reusability. But how do you make the functions defined in one file accessible to other files? In this article, we will explore how to export multiple functions from a JavaScript file. Let’s say you have a JavaScript file where you define a few functions, like this: function sum(a, b) { return a + b; } function mul(a, b) { return a * b; } To make these functions available to other files, you can use the export keyword....

Are you wondering how to find a specific character within a string using JavaScript? Don’t worry, we’ve got you covered! In this blog post, we’ll explore two methods that can help you achieve this. Method 1: Using the includes() Method One easy way to find a character in a string is by utilizing the includes() method. This method is available for all strings in JavaScript and allows you to check if a string contains a specific character....

In this tutorial, we will explore how to get started with Svelte, a JavaScript framework that offers a unique approach to building web applications. Unlike other frameworks like React, Vue, and Angular, Svelte compiles your app beforehand. This means that your site visitors don’t need to download the framework and library code, resulting in a smoother user experience with lower bandwidth usage. Just like using Hugo as a static site generator, where the generated pages are plain HTML, Svelte also disappears at deployment, leaving you with plain JavaScript....

Discover the basics of working with forms in HTML and JavaScript to enhance user interaction and enable various functionalities on your web page. Forms play a crucial role in HTML and the Web Platform as they allow users to interact with the page in various ways, such as searching for something on the site, triggering filters to narrow down result pages, and sending information. By default, forms submit their content to a server-side endpoint, with the default endpoint being the page URL itself....

When encountering unexpected problems, handling exceptions is the preferred approach in JavaScript. This article will guide you through the basics of creating and handling exceptions in JavaScript. Creating Exceptions To create an exception, use the throw keyword followed by a value. This value can be any JavaScript value, such as a string, number, or object. Here’s an example: throw value When this line of code is executed, the normal program flow is immediately halted, and control is transferred to the nearest exception handler....

If you want to add an event listener to multiple elements in JavaScript, there are a couple of approaches you can take. In this article, we will explore two methods: using a loop and leveraging event bubbling. Method 1: Using a Loop The first method involves using a loop to iterate over the elements and attach the event listener individually. Here’s an example: document.querySelectorAll('.some-class').forEach(item => { item.addEventListener('click', event => { // handle click }); }); In the above code, querySelectorAll() is used to select all elements with a specific class....

Adding an image dynamically to an HTML page, or the DOM, can be done programmatically using JavaScript. In this article, we will go through the steps to achieve this. To begin, we need to create an img element using the createElement method of the Document object: const image = document.createElement('img'); Next, we set the src attribute of the image to specify the image URL: image.src = '/picture.png'; You can use either a relative or an absolute URL, just like you would in a regular HTML img tag....

If you need to add an item at the beginning of an array in JavaScript, you can use the splice() method. This method allows you to make modifications to an array by specifying the start index, the delete count, and the items you want to add. To add an item at the first position of the array, you can follow these steps: const colors = ['yellow', 'red']; colors.splice(0, 0, 'blue'); // colors === ['blue', 'yellow', 'red'] In the example above, we have an array called colors with two elements: ‘yellow’ and ‘red’....

Learn how to add an item to an array at a specific index in JavaScript. If you want to add an item to an array at a specific position instead of appending it at the end, you can do so by specifying the index where you want to add the item. Note: Array indexes start from 0. So, to add an item at the beginning of the array, you would use index 0....

Discover the different ways JavaScript provides for appending an item to an array and learn about the recommended approach. Appending a Single Item In order to append a single item to an array, you can make use of the push() method offered by the Array object. Here’s an example: const fruits = ['banana', 'pear', 'apple']; fruits.push('mango'); It’s important to note that push() modifies the original array. If you want to create a new array instead of modifying the original one, you can employ the concat() method of the Array object....