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JavaScript Jobs: Top 100 Interview Questions 1) Explain what is Javascript? Javascript is an object-oriented computer programming language commonly used to create interactive effects within web browsers.It is first used by the Netscape browser, that provides access to the HTML document object model (DOM), provides access to the browser object model (BOM). Javascript syntax looks a lot like java, c or c++ syntax. Below is the list of data types supported by Javascript:- Undefined Null Boolean String Symbol Number Object 2) What close() does in Javascript? In Javascript close() method is used to close the current window. You must write window.close() to ensure that this command is associated with a window object and not some other JavaScript object. 3) What is the difference between let and var? Both var and let are used for variable/ method declaration in javascript but the main difference between let and var is that var is function scoped whereas let is block scoped. 4...

D3.js Jobs: Top 100 Interview Questions  1) Define D3.js? D3.js is defined as a JavaScript-based library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. D3’s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation. 2) What does D3 stand for? D3 stands for  Data-Driven Documents 3) Who developed D3.js? Mike Bostock  wrote D3.js based on his work during his Ph.D. studies at the Stanford Visualization Group. Mike worked at The New York Times for a while and is now independently working on D3.js. 4) Why use D3.js? You can use D3 js because D3.js lets you to build the data visualization framework D3.js focuses on binding data to DOM elements. D3.js is written in JavaScript and uses a functional style which means you can reuse code and add specific f...

1) What is Python? What are the benefits of using Python? Python is a programming language with objects, modules, threads, exceptions and automatic memory management. The benefits of pythons are that it is simple and easy, portable, extensible, build-in data structure and it is an open source. 2) What is PEP 8? PEP 8 is a coding convention, a set of recommendation, about how to write your Python code more readable. 3) What is pickling and unpickling? Pickle module accepts any Python object and converts it into a string representation and dumps it into a file by using dump function, this process is called pickling. While the process of retrieving original Python objects from the stored string representation is called unpickling. 4) How Python is interpreted? Python language is an interpreted language. Python program runs directly from the source code. It converts the source code that is written by the programmer into an intermediate...

What are the key features of React.js? What is React? React is a JavaScript library created for building fast and interactive user interfaces for web and mobile applications. It is an open-source, component-based, front-end library responsible only for the application’s view layer. In Model View Controller (MVC) architecture, the view layer is responsible for how the app looks and feels. React was created by Jordan Walke, a software engineer at Facebook.  Fig: MVC architecture Let’s take a look at an Instagram webpage example, entirely built using React, to get a better understanding of how React works. As the illustration shows, React divides the UI into multiple components, which makes the code easier to debug. This way, each component has its property and function. Fig: Instagram Components Now that we know what React is let’s move on and see why React is the most popular front-end library for web application development. Why React? React’s popularity today has eclipsed ...

What are the key features of D3.js? What is D3.js? D3.js is a JavaScript library used to create interactive visualizations in the browser. The D3.js library allows us to manipulate elements of a webpage in the context of a data set. These elements can be HTML, SVG, or Canvas elements and can be introduced, removed, or edited according to the contents of the data set. It is a library for manipulating the DOM objects. D3.js can be a valuable aid in data exploration, it gives you control over your data's representation and lets you add interactivity. Why Do We Need D3.js? D3.js is one of the premier frameworks when compared to other libraries. This is because it works on the web and its data visualizations are par excellence. Another reason it has worked so well is owing to its flexibility. Since it works seamlessly with the existing web technologies and can manipulate any part of the document object model, it is as flexible as the Client-Side Web Technology Stack (HTML, CSS, a...

JavaScript Jobs: Interview Questions What are the key features of JavaScript? JavaScript language consists of several different features. Some of the general JavaScript features are as follows – Validating User’s Input JavaScript is very useful while using forms. It has the capability to validate user input for errors and also saves time. If the user leaves a required field empty or the information is incorrect, JavaScript checks for them before sending the data over to the server. Simple Client-side Calculations Since JavaScript is a client-side technology, it can perform basic calculations on the browser. The browser does not need to ask server time for every task. This is especially helpful when a user needs to perform these calculations repeatedly. In these cases, connecting to the server would take a lot more time than performing the actual calculations. Greater Control JavaScript provides greater control to the browser rather than being completely dependent on the web...

TypeScript Jobs: Interview Questions  What are the key features of TypeScript? TypeScript is just JavaScript. TypeScript starts with JavaScript and ends with JavaScript. Typescript adopts the basic building blocks of your program from JavaScript. Hence, you only need to know JavaScript to use TypeScript. All TypeScript code is converted into its JavaScript equivalent for the purpose of execution. TypeScript supports other JS libraries. Compiled TypeScript can be consumed from any JavaScript code. TypeScript-generated JavaScript can reuse all of the existing JavaScript frameworks, tools, and libraries. JavaScript is TypeScript. This means that any valid .js file can be renamed to .ts and compiled with other TypeScript files. TypeScript is portable. TypeScript is portable across browsers, devices, and operating systems. It can run on any environment that JavaScript runs on. Unlike its counterparts, TypeScript doesn’t need a dedicated VM or a specific runtime environment to exec...