--- title: "Alok Kumar (@thecoollearner) | Hashnode" description: "Frontend Developer. Read the latest articles by Alok Kumar on Hashnode." url: "https://hashnode.com/@thecoollearner" --- @thecoollearner # Alok Kumar @thecoollearner 路 Joined December 2020 Frontend Developer [Website](https://the-cool-learner.netlify.app/home) ### [React: Behind the Scenes](https://blog.utkallabs.com/react-behind-the-scenes?utm_source=hashnode&utm_medium=feed) Generally, when we start writing a react code we start with a create-react-app setup and write our code in a JSX file but today we will use just a single HTML file. We will start with setting up a project and creating one HTML file called index.html ... 5 min read 路 [blog.utkallabs.com](https://blog.utkallabs.com/react-behind-the-scenes?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/react-behind-the-scenes/6553766143602d907d7d3eb0) [Nov 14, 2023](https://hashnode.com/posts/react-behind-the-scenes/6553766143602d907d7d3eb0) ### [How to show Image upload preview](https://blog.utkallabs.com/how-to-show-image-upload-preview?utm_source=hashnode&utm_medium=feed) Hey All 馃憢馃憢馃憢 In this article, I am about to discuss something that was given to me as part of my interview task. Which was to create a preview of the picture before it is uploaded. So let's start. Here, I have used a React application. After clear... 2 min read 路 [blog.utkallabs.com](https://blog.utkallabs.com/how-to-show-image-upload-preview?utm_source=hashnode&utm_medium=feed) [3](https://hashnode.com/posts/how-to-show-image-upload-preview/6396a3d46fae8e8041eb1c9d) [Dec 12, 2022](https://hashnode.com/posts/how-to-show-image-upload-preview/6396a3d46fae8e8041eb1c9d) ### [The Art of asking questions as a DEV](https://thecoollearner.hashnode.dev/the-art-of-asking-questions-as-a-dev?utm_source=hashnode&utm_medium=feed) Hey All 馃憢, Today's topic will be a little deviated from JavaScript and web dev, but not entirely. Today, I will talk about the importance of asking questions in a developer's life and the different aspects related to questions. So, stick till last :... 4 min read 路 [thecoollearner.hashnode.dev](https://thecoollearner.hashnode.dev/the-art-of-asking-questions-as-a-dev?utm_source=hashnode&utm_medium=feed) [Sep 17, 2021](https://hashnode.com/posts/the-art-of-asking-questions-as-a-dev/61445d3adbe60379639b1c41) ### [Getting Started with JavaScript Classes](https://thecoollearner.hashnode.dev/getting-started-with-javascript-classes?utm_source=hashnode&utm_medium=feed) Hey All 馃憢 , with this article I'm going to start a series of articles on JavaScript concepts. So I'm starting off this series with an article on JavaScript Classes. In this article, I'm going to cover all you need to get started with JS classes. Ta... 8 min read 路 [thecoollearner.hashnode.dev](https://thecoollearner.hashnode.dev/getting-started-with-javascript-classes?utm_source=hashnode&utm_medium=feed) [Sep 5, 2021](https://hashnode.com/posts/getting-started-with-javascript-classes/613496bf489de51a6a7af4b8) ### [Regex 101](https://thecoollearner.hashnode.dev/regex-101?utm_source=hashnode&utm_medium=feed) In this article, we are going to talk about Regular expressions, or in general, it is called "Regex" in which "Reg" stands for Regular and "ex" stands for Expressions. In this article, I'm going to use the Regex word only, for Regular Expressions. So... 11 min read 路 [thecoollearner.hashnode.dev](https://thecoollearner.hashnode.dev/regex-101?utm_source=hashnode&utm_medium=feed) [Aug 15, 2021](https://hashnode.com/posts/regex-101/6118ddbd888ca15f5d38a84c)