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What is JavaScript?

JavaScript is a high-level, interpreted programming language that is used primarily on the web. It was created in 1995 by Brendan Eich while he was working at Netscape Communications Corporation. JavaScript was initially designed to be a client-side scripting language, meaning it runs in the user’s web browser, but it has since been expanded to be used on the server-side as well.

JavaScript is an object-oriented language, which means that it is based on objects that have properties and methods. It is a versatile language that can be used to create dynamic and interactive web pages, as well as to build complex web applications, mobile apps, and even desktop applications.

Some of the key features of JavaScript include:

  • Dynamic typing: JavaScript does not require you to declare the data type of a variable before using it.
  • Prototypal inheritance: JavaScript uses prototypal inheritance, which means that objects can inherit properties and methods from other objects.
  • Functions as first-class citizens: Functions in JavaScript are treated as first-class citizens, which means they can be passed as arguments to other functions, returned from functions, and assigned to variables.

JavaScript is widely used in web development, and it is supported by all modern web browsers. It is also used in many other environments, including mobile app development, game development, and server-side programming. Some of the popular frameworks and libraries built on top of JavaScript include React, Angular, Vue.js, and Node.js.