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.

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 ...

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...

Encryption and Decryption Data/Password in Angular

You can use crypto.js to encrypt data. We have used 'crypto-js'. Follow the below steps, Steps 1 – Install CryptoJS using below NPM commands in your project directory npm install crypto-js --save npm install @types/crypto-js –save After installing both above commands it looks like – NPM Command 1 -> npm install crypto-js --save NPM Command 2 -> npm install @types/crypto-js --save Steps 2 - Add the script path in “ angular.json ” file. "scripts" : [ "../node_modules/crypto-js/crypto-js.js" ] Steps 3 – Create a service class “ EncrDecrService ” for encrypts and decrypts get/set methods . Import “ CryptoJS ” in the service for using encrypt and decrypt get/set methods . import { Injectable } from ...

How To convert JSON Object to String?

To convert JSON Object to String - To convert JSON Object to String in JavaScript using “JSON.stringify()”. Example – let myObject =[ 'A' , 'B' , 'C' , 'D' ] JSON . stringify ( myObject ); ü Stayed Informed – Object Oriented JavaScript Interview Questions I hope you are enjoying with this post! Please share with you friends!! Thank you!!!

Angular Testing Questions and Answers | 9, 8, 7, 6

What Is Testing? The testing is a tools and techniques for a unit and integration testing Angular applications . Why Test? Tests are the best ways to prevent software bugs and defects. How to Setup Test in Angular Project? Angular CLI install everything you need to test an Angular application. This CLI command takes care of Jasmine and karma configuration for you. Run this CLI command- ng test The test file extension must be “.spec.ts” so that tooling can identify the test file. You can also unit test your app using other testing libraries and test runners. Types of Test – The all great developer knows his/her testing tools use. Understanding your tools for testing is essential before diving into writing tests. The Testing depends on your project requirements and the project cost. The types of Testing looks like - 1. Unit Test 2. Integration Test 3. En...

Anil Singh | Code-sample.com

Search This Blog