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What is java script | What is java interview questions

Abhishek Bhardwaj by Abhishek Bhardwaj
August 15, 2022
in Javascript
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What is java script?

What is java script?

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Have you ever wondered, ‘what is JavaScript used for?’ ‘what is java script’ ‘what is java interview questions’ etc. You’re not alone. In this article, I will breaks down what JavaScript is, what JavaScript is used for, and why we use JavaScript as a programming language.

What is Java Script?

JavaScript is a programming language. It’s one of the three front-end languages. JavaScript is responsible for the “behavior” of your Website. It’s how HTML elements and CSS style animate and move around on the page.
It is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. Where HTML and CSS are languages that give structure and style to web pages, JavaScript gives web pages interactive elements that engage a user. Common examples of JavaScript that you might use every day include the search box on Amazon, a news recap video embedded on The Indian Express, or refreshing your FaceBook feed.

Incorporating JavaScript improves user experience of the web page by converting it from a static page into an interactive one. To recap, JavaScript adds behavior to web pages.

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What is JavaScript used for?


JavaScript is mainly used for web-based applications and web browsers. But JavaScript is also used beyond the Web in software, servers and embedded hardware controls. Here are some basic things JavaScript is used for:

1.Adding interactive behavior to web pages


JavaScript allows users to interact with web pages. There are almost no limits to the things you can do with JavaScript on a web page — these are just a few examples:

  • Show or hide more information with the click of a button
  • Change the color of a button when the mouse hovers over it
  • Slide through a carousel of images on the homepage
  • Zooming in or zooming out on an image
  • Displaying a timer or count-down on a website
  • Playing audio and video in a web page
  • Displaying animations
  • Using a drop-down hamburger menu

2. Creating web and mobile apps

Developers can use various JavaScript frameworks for developing and building web and mobile apps. JavaScript frameworks are collections of JavaScript code libraries that provide developers with pre-written code to use for routine programming features and tasks — literally a framework to build websites or web applications around.

Popular JavaScript front-end frameworks include React, React Native, Angular, and Vue. Many companies use Node.js, a JavaScript runtime environment built on Google Chrome’s JavaScript V8 engine. A few famous examples include Paypal, LinkedIn, Netflix, and Uber!

3. Building web servers and developing server applications

Beyond websites and apps, developers can also use JavaScript to build simple web servers and develop the back-end infrastructure using Node.js.

4. Game development

Of course, you can also use JavaScript to create browser games. Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. These are a great way for beginning developers to practice their JavaScript skills.

Why use JavaScript over other programming languages?

Aside from the unlimited possibilities, there are many reasons for web developers to use JavaScript over other programming languages:

  • JavaScript is the only programming language native to the web browser
  • JavaScript is the most popular language
  • There’s a low threshold to get started
  • It’s a fun language to learn
  • For more reasons, see our blog on why JavaScript is the best coding language to learn.

Try JavaScript on official website.

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What is Garbage Collection in the Context of Java

Java Garbage Collection (GC) is the process of tracking the live objects while destroying unreferenced objects in the Heap memory in order to reclaim space for future object allocation.

What is java script | What is java interview questions
What is Garbage Collection in the Context of Java

Garbage Collection (GC) enables faster development with less boilerplate code (no need for manually allocating and releasing memory) and eliminates memory-related issues. However, in reality, JVM performs garbage collection by creating and removing too many objects, which results in serious performance problems. In order to effectively manage garbage collection and memory issues in JVM, you need to understand how garbage collection really works under the hood.

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