JavaScript Concepts and Applications

JavaScript is a versatile, high-level language created in 1995 by Brendan Eich for the Netscape browser. Initially called Mocha, it was designed to be easy to learn and has since evolved through the ECMAScript standard. Known for building web applications, JavaScript is the only language natively supported in browsers besides WebAssembly. It can also be used for server-side applications with Node.js, mobile apps with React Native, and desktop apps with Electron. Despite being single-threaded, JavaScript handles I/O tasks efficiently with a non-blocking event loop. Beginners can start by creating a .js file and using the console for debugging. JavaScript supports variables, functions, classes, and asynchronous programming with promises and async/await. It can run on servers using Node.js, interacting with APIs like the file system. The video concludes with a call to action to engage with more content.

Who created JavaScript and in what year?

• James Gosling in 1991

• Brendan Eich in 1995

• Guido van Rossum in 1989

• Tim Berners-Lee in 1990

What was the original name of JavaScript?

• Cappuccino

• Espresso

• Mocha

• Latte

Which standard does JavaScript evolve through?

• IEEE

• ISO

• W3C

• ECMAScript

Which of the following is NOT a use of JavaScript?

• Building front-end web applications

• Creating mobile applications

• Designing operating systems

• Developing server-side applications

What makes JavaScript efficient at handling I/O intensive jobs?

• The use of global variables

• Its compiled nature

• The non-blocking event loop

• Its multi-threaded nature

How do you start writing JavaScript code?

• Create a .java file

• Create a .js file

• Create a .py file

• Create a .html file

Which keyword is used for variables that cannot be reassigned?

• static

• const

• let

• var

What is a common use of JavaScript in web development?

• Compiling code

• Manipulating the DOM

• Creating operating systems

• Managing databases

What is the purpose of the 'async/await' syntax in JavaScript?

• To handle synchronous operations

• To declare variables

• To perform asynchronous operations

• To define classes

Which of the following is a feature of JavaScript's functional programming?

• Inheritance

• Polymorphism

• Encapsulation

• First-class functions