The app gets really big, and your Javascript takes too long to download, especially on mobile devices with slow connections.However there at some point, when you make a complex enough app you might hit a few problems: You can reuse so much technology that you can quickly get an impressive app made in minutes. There are also tools for making Excel-like tables, or code editors and much more. You can use the script tag to pull in great libraries, like React, JQuery and many others to make your life easier developing certain kinds of UI. If you want to use other people’s scripts to help build your application, you can include them via the src attribute of the script tag. From there you could write code to do something when you click a button, submit a form and much more. You get immediate feedback about what you are doing. You can write a simple piece of HTML, add some Javascript, such as alert('hello'), and open that in your browser. One of Javascript’s best features is you can start out really simple and learn it with just a text editor and a web browser. (This article was originally publish on my JavaScript Website, and I thought it would be very useful for React developers too.) You are probably going to bump into Webpack at some point if you are doing React development, and if you do it’s good to be armed with an idea of what it’s about, what it does, why it is needed and where it fits in (with Node, NPM etc.)
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