This is the foremost tutorial in the JavaScript programming language tutorial series. This JavaScript tutorial series has been prepared for both JavaScript beginners and professionals to get a thorough understanding of JavaScript and its functionalities. Further, this will enormously help them to build remarkable dynamic web applications effortlessly. To get the complete A-Z JavaScript knowledge base, continue with this tutorial series until the final lesson.
What Exactly is JavaScript?
JavaScript often referred to as JS, is the most useful and popular object-oriented, interpreted programming language. Plus, it is one of the essential technologies of the World Wide Web.
While HTML and CSS decide the content and the layout of the web page JavaScript decides the behavior of the web page. When JavaScript is added to an HTML document, it allows for dynamic interactivity on websites. JavaScript lets users dynamically modify the contents of an application.
Significant Features of JavaScript
● As popular web browsers have built-in execution environments, they support JavaScript.
● It is an object-oriented language that inherits through prototypes rather than classes.
● Can able to create network-centric apps with this framework.
● It is a simple and interpretable language.
● It is a case-sensitive language.
● Java-compatible and integrated
● Complementary to and integrated with HTML.
● Cross-platform and open
● JavaScript runs on Windows, Mac OS X, and Linux.
● It offers users complete control over their web browsers.
Advantages of JavaScript
● Before transmitting the page to the server, you can validate user inputs. This reduces server traffic, resulting in a lower server load.
● It is easy to understand and learn JavaScript.
● Support in providing immediate feedback to the visitors.
● JavaScript is widely used on the internet.
● Increase user interactivity.
● JavaScript allows developers to create engaging websites with a range of interfaces.
Disadvantages of JavaScript
● The reading and writing of files is not possible with client-side JavaScript. For the purpose of security, this has been maintained.
● Lack of Debugging Facility
● In different browsers, JavaScript is interpreted differently.
● JavaScript cannot be utilized in developing networking applications because there is no such support available.
● Multi-threading and multiprocessors are not supported by JavaScript.
JavaScript Overview
The file extension of the JavaScript files is .js. In an HTML document, you can insert a JavaScript code between the <script> and </script> tags. The <script> tags should be placed between <body> and </body> or <head> and </head> section of the HTML document. But that’s not all, you can also include links to external JavaScript files. External JavaScript files will separate HTML and JavaScript code, making it easier to understand and maintain the code and can able to add several JavaScript files to a single HTML page. There are 03 ways to link your external JavaScript files. Let’s see how you can do that.
The programming languages use variables to store data values. JavaScript uses let, var, and const keywords to declare variables, and the equal sign (=) is used to assign values to variables. Identifiers are the names given to variables, keywords, and functions in JavaScript. A JavaScript name must begin with a letter (A-Z or a-z), dollar sign ($), or underscore (_). Keep in mind that, you can’t use a number as the first character in JavaScript names.
The JavaScript function is a block of code, which can be can be called when an event occurs. For example, change the color of a text when the user clicks a button.
jQuery is one of the most widely used JavaScript libraries which reduces the need for a range of JavaScript codes. jQuery can be used for both simple and complex web projects and is compatible with all major browsers.
Moreover, JavaScript has high demand among Front-end developers, Back-end developers, web developers, etc. Learning JavaScript (JS) would be a plus point for your career development in the IT field. In this JavaScript tutorial, you learned what JavaScript is and an overview of the JavaScript language. There are many more things to learn in the JavaScript programming language. Keep in touch with the upcoming JavaScript tutorial series.