Introduction of JavaScript

Introduction of JavaScript

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Introduction of JavaScript

JavaScript is a scripting programming language that allows us to implement complex features on our web pages that is used for converting static web pages to interactive and dynamic web pages.

  • JavaScript is a light-weight Object Oriented programming language which is used by several websites for scripting the webpages.
  • JavaScript is a single threaded language that executes one task at a time.
  • In JavaScript the type of variable is check during run time that’s why it’s called as dynamically typed language.

Example :-

<script type=”text/javascript”>

document.write(“JavaScript is a simple language”);
</script>

  • The script tag specifies that we are using JavaScript.
  • The text/javascript is the content type that provide information to the browser about the data.
  • The document.write() function is used to display dynamic content through JavaScript.

JavaScript Comments

The JavaScript comments can be used to explain the JavaScript code and to make it more readable to understand.

Types of Comments:

Single line: It is represented by double forwarded slashes(//)

Multi line: It can be used to add single as well as multi line comments. So it is more convenient.

Features of JavaScript ?

  1. All popular web browsers support JavaScript as they provide built in execution environments.
  2. JavaScript follows the Syntax and structure of the C programming language. Thus it is a structured programming language.
  3. JavaScript is a Weakly typed language, where certain types are implicitly cost.
  4. JavaScript is an Object Oriented programming language, wherever it is also use as prototypes rather than using classes for inheritance.
  5. It is a lightweighted and interpreted language.
  6. It is a case sensitive language.
  7. It Provides Good control to the users over the web browsers.

Application of JavaScript ?

  • Web Development (interactive websites).
  • Web Applications (e.g., Gmail, Google Maps).
  • Mobile App Development (React Native).
  • Game Development (browser-based games).
  • Server-Side Development (Node.js).
  • Desktop Applications (e.g., Discord, Spotify).
  • Data Visualization (charts and graphs with D3.js).
  • Internet of Things (IoT).

Advantages of JavaScript ?

  • Easy to Learn: JavaScript is simple to understand and fun to use.
  • Fast: It works quickly because it runs in your browser.
  • Interactive: It makes websites fun by adding things like buttons, animations, and games.
  • Works Everywhere: You can use it on all modern websites and devices.
  • Lots of Help: Many people use JavaScript, so there are tutorials and tools to help you.

Disadvantages of JavaScript ?

  • Not Always Safe: If not done carefully, it can be hacked.
  • Browser Issues: Sometimes, it works differently on different browsers.
  • Can Break: If there’s a mistake in the code, it might stop working.
  • Slows Down Websites: If not written well, it can make websites load slowly.
  • Depends on Browser: If someone turns off JavaScript in their browser, it won’t work.

 

 

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