What Is JavaScript?


JavaScript is a scripting language that makes web pages more dynamic and interactive. It is also used for game development and mobile application development. The use of JavaScript has been embraced by many tech giants and is growing rapidly.

Before JavaScript was introduced in 1995, websites were plain text. This made the internet less universally accessible. Until then, web developers had to choose which browser family to work with. Some browsers like Netscape Navigator and Microsoft Internet Explorer did not support the programming language.

JavaScript allows the user to enter information and submit a form on the web. The form data is processed before sending it to the server. This reduces the amount of server traffic. As a result, the web page is more dynamic and easier to navigate. In addition, the user is given immediate feedback on the content they submitted.

While JavaScript is a powerful tool, it has several limitations. For instance, it does not allow multi-threading. It cannot run on multiple processors, which is necessary for networking applications. Plus, it is interpreted, so it does not have the ability to store data on a remote server.

Because of these shortcomings, developers have been working to make JavaScript more effective. In response, a number of libraries have been developed. These libraries are shorter and more concise. They help users build simpler applications with more features. And, they are specialized for specific applications.

Originally, JavaScript was a client-side scripting language, meaning it only executed on the client’s machine. Today, it is a compiled language, which means that it is compiled and interpreted by the browser before it is sent to the visitor’s computer. A compiled language is generally faster and more flexible. But it is not recommended for networking applications.

Since its inception, JavaScript has been modified and enhanced. Over the years, the programming language has been standardized, dubbed ECMAScript, and rewritten to address changes in processing power and Internet bandwidth.

Most modern web browsers support JavaScript. Many popular sites and apps have been built with it. The Facebook timeline is a great example of how it has been used in action. When a user searches, Google suggests a variety of search terms based on letters the user has typed into the search box.

Besides making web pages more interactive, JavaScript can create single-page applications. Single-page applications are small pieces of code that can be run on a single HTML page.

Scripts can be written directly in a web page’s HTML or a separate.js file. However, it is best to place the JavaScript at the end of the body. Once the page is loaded, it will run the script. You can also write the code in a header file, but you will need to add a ‘defer’ attribute to the script. If you do this, the script will run after the CSS has been applied.

Another feature of JavaScript is the ability to validate user input. For instance, if the user fills out a form on the website, JavaScript will check the lines of code to see if they match the required fields. This is a way to decrease the amount of data sent to the server and provide immediate feedback to the user.