CoffeeScript Interview Questions and Answers

What Is CoffeeScript?

CoffeeScript is a very simple, small programming language that compiles into JavaScript.

The main purpose of CoffeeScript is –

ü Write simple and better code

ü More relevant syntax and

ü Avoiding the irregular nature of JavaScript code

CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way.

CoffeeScript was designed and developed by Jeremy Ashkenas in Dec, 2009.

Jeremy Ashkenas was inspired by Python, Ruby and Haskell and it adopted syntax and coding styles from them which makes it very useful and unique.

1. Filename extensions- coffee, .litcoffee

2. First appeared- Dec 13, 2009

3. Stable release- 2.0.0 / Sep 18, 2017

4. Designed by- Jeremy Ashkenas

5. Influenced by- Haskell, JavaScript, Perl, Python, Ruby, YAML

6. License- MIT License

The CoffeeScript Latest Version is - 2.2.2

1. Install locally for a project - npm install --save-dev coffeescript

2. Install globally to execute .coffee files - npm install --global coffeescript

What Are the basic rules to remember for CoffeeScript?

The Rules for CoffeeScript is -

1. Whitespace matters

2. No parentheses

What Are the advantages of CoffeeScript over JavaScript?

1. Lots of less code with CoffeeScript rather than JavaScript.

2. Easier to perform with CoffeScript rather than JavaScript

3. Contains lightweight add-ons.

What Are the disadvantages of CoffeeScript?

1. CoffeeScript includes an additional compilation step while compilation - compiles into JavaScript

2. Only limited resources are available for CoffeeScript.

Are there particular types of JavaScript development that would benefit from CoffeeScript?

Myself, I’m used CoffeeScript for web development, game development and others that I want to end up in JavaScript. Regardless of what libraries you are building for, the output of CoffeeScript is JavaScript, so there is nothing that it cannot do.

What's New In CoffeeScript 2?

Major new features in CoffeeScript 2 are -

1. CoffeeScript 2 include async functions

2. CoffeeScript 2 include JSX

3. Support for modern JavaScript syntax

4. CoffeeScript 2 compiler produces modern JavaScript syntax - ES6, or ES2015 and others

What Is the difference between variables in CoffeeScript and JavaScript?

In the JavaScript, you have to add semicolon at the end of statements while in the CoffeeScript no need to add semicolon at the end of the statements.

What Is function in CoffeeScript?

A function in CoffeeScript is an Optional list of parameters followed by an arrow (->), and then the function body.

The example looks like-

// square = (x) -> x * x

// cube = (x) -> square(x) * x

// log = (message) -> console.log message

Why Is CoffeeScript getting popularity day by day?

CoffeeScript is most popular language in GitHub. Currently, it is on 11the place on GitHub and the main purpose is to produce simple, little JavaScript without writing much code.

Reasons behind the popularity -

1. Very Little Coding is required when programming in CoffeeScript as compared to JavaScript.

2. CoffeeScript includes all the good features of JavaScript.

3. You can use any existing JavaScript library seamlessly with CoffeeScript.

Is it possible to bind parameters to properties in CoffeeScript?

Yes!, you can bind parameters to properties in CoffeeScript by using @ shorthand and It can also be used to define class functions.

By Anil Singh | Rating of this article (*****)

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1: To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = { providers: [ provideRouter(routes), provideClientHydration(), provideHttpClient () ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...

React Lifecycle Components | Mounting, Updating, Unmounting

In React, each component has a life-cycle which manipulate during its three main phases. The following three phases are: 1. Mounting 2. Updating 3. Unmounting React does so by “ Mounting ” (adding nodes to the DOM), “ Unmounting ” (removing them from the DOM), and “ Updating ” (making changes to nodes already in the DOM). Mounting - Lifecycle Phase 1 Mounting is used for adding nodes (elements) to the DOM. The React has four built-in methods that gets called, in this order, when mounting a component - 1. constructor() 2. getDerivedStateFromProps() 3. render() 4. componentDidMount() Note – 1) The render() method is required and It always be called and the others methods are optional (you will call...

51 Best React Interview Questions and Answers

1) What Is React? React is a fast, open-source, and front-end JavaScript library and It was developed by Facebook in 2011 for building complex, stateful and interactive UI in web as well as mobile Applications. React follows the component based approach which helps you to building reusable and interactive web and mobile user interface (UI) components. React has one of the largest communities supporting it. The high level component Lifecycle - At the highest level component Lifecycle, React components have lifecycle events that are - 1. Initialization 2. State/Property Updates 3. Destruction Explore to detail understanding - React Lifecycle Components Reactjs is very fast technology that can be trusted for complex tasks and can simply be trusted for quality outcomes. 2) When Reactjs released? March 2013 3) What Is the current stable version of ...

Angular 8, 7, 6, 5, 4, 2 - Open and Close Modal Popup Using Typescript and Bootstrap

How to Create a Modal Popup for Angular? Two ways to CREAT Modal Popup Window - 1. Modal Popup using Typescript and Bootstrap 2. Modal Popup using Angular Material Dialogue Open Modal Popup Using Typescript and Bootstrap – Download and use the Bootstrap CDN to deliver Bootstrap's compiled CSS and JS to your project. Steps 1 – Add Bootstrap CSS and Js files in the AppComponent.HTML file. < link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" crossorigin = "anonymous" > < script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" crossorigin = "anonymous" ></ script > You can also Install Bootstrap from NPM – npm install bootstrap – save Steps 2 – Add Style CSS for Login and Popup validations and it looks like. .ng-valid[ required ], .ng-valid.required { ...

Anil Singh | Code-sample.com

Search This Blog