Interview Questions

AJAX Interview Questions Android Interview Questions Angular 2 Interview Questions AngularJs Interview Questions Apache Presto Interview Questions Apache Tapestry Interview Questions Arduino Interview Questions ASP.NET MVC Interview Questions Aurelia Interview Questions AWS Interview Questions Blockchain Interview Questions Bootstrap Interview Questions C Interview Questions C Programming Coding Interview Questions C# Interview Questions Cakephp Interview Questions Cassandra Interview Questions CherryPy Interview Questions Clojure Interview Questions Cobol Interview Questions CodeIgniter interview Questions CoffeeScript Interview Questions Cordova Interview Questions CouchDB interview questions CSS Buttons Interview Questions CSS Interview Questions D Programming Language Interview Questions Dart Programming Language Interview Questions Data structure & Algorithm Interview Questions DB2 Interview Questions DBMS Interview Questions Django Interview Questions Docker Interview Questions DOJO Interview Questions Drupal Interview Questions Electron Interview Questions Elixir Interview Questions Erlang Interview Questions ES6 Interview Questions and Answers Euphoria Interview Questions ExpressJS Interview Questions Ext Js Interview Questions Firebase Interview Questions Flask Interview Questions Flex Interview Questions Fortran Interview Questions Foundation Interview Questions Framework7 Interview Questions FuelPHP Framework Interview Questions Go Programming Language Interview Questions Google Maps Interview Questions Groovy interview Questions GWT Interview Questions Hadoop Interview Questions Haskell Interview Questions Highcharts Interview Questions HTML Interview Questions HTTP Interview Questions Ionic Interview Questions iOS Interview Questions IoT Interview Questions Java BeanUtils Interview Questions Java Collections Interview Questions Java Interview Questions Java JDBC Interview Questions Java Multithreading Interview Questions Java OOPS Interview Questions Java Programming Coding Interview Questions Java Swing Interview Questions JavaFX Interview Questions JavaScript Interview Questions JCL (Job Control Language) Interview Questions Joomla Interview Questions jQuery Interview Questions js Interview Questions JSF Interview Questions JSP Interview Questions KnockoutJS Interview Questions Koa Interview Questions Laravel Interview Questions Less Interview Questions LISP Interview Questions Magento Interview Questions MariaDB Interview Questions Material Design Lite Interview Questions Materialize CSS Framework Interview Questions MathML Interview Questions MATLAB Interview Questions Meteor Interview Questions MongoDB interview Questions Moo Tools Interview Questions MySQL Interview Questions NodeJS Interview Questions OpenStack Interview Questions Oracle DBA Interview Questions Pascal Interview Questions Perl interview questions Phalcon Framework Interview Questions PhantomJS Interview Questions PhoneGap Interview Questions Php Interview Questions PL/SQL Interview Questions PostgreSQL Interview Questions PouchDB Interview Questions Prototype Interview Questions Pure CSS Interview Questions Python Interview Questions R programming Language Interview Questions React Native Interview Questions ReactJS Interview Questions RequireJs Interview Questions RESTful Web Services Interview Questions RPA Interview Questions Ruby on Rails Interview Questions SAS Interview Questions SASS Interview Questions Scala Interview Questions Sencha Touch Interview Questions SEO Interview Questions Servlet Interview Questions SQL Interview Questions SQL Server Interview Questions SQLite Interview Questions Struts Interview Questions SVG Interview Questions Swift Interview Questions Symfony PHP Framework Interview Questions T-SQL(Transact-SQL) Interview Questions TurboGears Framework Interview Questions TypeScript Interview Questions UiPath Interview Questions VB Script Interview Questions VBA Interview Questions WCF Interview Questions Web icon Interview Questions Web Service Interview Questions Web2py Framework Interview Questions WebGL Interview Questions Website Development Interview Questions WordPress Interview Questions Xamarin Interview Questions XHTML Interview Questions XML Interview Questions XSL Interview Questions Yii PHP Framework Interview Questions Zend Framework Interview Questions Network Architect Interview Questions

Top 25 CoffeeScript Interview Questions for 2022

1) What is CoffeeScript?

It is a language that compiles into JavaScript. CoffeeScript is an attempt to expose good parts of JavaScript so, that user can code more easily.

2) Name the founder of CoffeeScript.

Jeremy Ashkenas founded in December, 2009. He also founded BackboneJS and UnderscoreJS.

3) List the languages CoffeeScript is inspired from ?

Three languages has most impact on CoffeeScript
  • Ruby
  • Python
  • Heskell

4) Write the basic rules for CoffeeScript Language?

It follows two rules 1. Indentation rule :
  • No Parenthesis
  • Short Function declaration
  • Define Character per line limit
2. Whitespace rule: CoffeeScript is very sensitive towards white space also no curly braces are allowed in script.

5) Enlist the advantage of CoffeeScript over JavaScript.

  • Write less do more in CoffeeScript than JavaScript.
  • It has very light weight add-ons such as Ruby string Interpolation.
  • It compiles to JavaScript Code.

6) Give the syntax difference of variable in CoffeeScript and JavaScript.

In CoffeeScript no keyword should be given to variable such as 'var' in JavaScript. Also, no semi-colon at end of statement.

7) Enlist the disadvantage of CoffeeScript.

  • Very less resources available for CoffeeScript Language.
  • It has additional step for compilation.

8) How can we convert CoffeeScript code in JavaScript?

We can convert it through the use of Transpilers which translate or convert the CoffeeScript code to JavaScript.

9) Describe Splat in CoffeeScript?

We use Splat term for the (...) operator for the var-argument. This argument can come either before, after or between arguments.

10) Explain Class method in CoffeeScript.

The objects created of a class are stored in object itself rather than Object Prototype which provides central location to store class-level values.

11) Differentiate between Assignment and Clone Function?

Both the functions are used to copy the object but the main difference is:
  • Assignment function only copies the reference of Object.
  • Clone Function creates a complete new Object.

12) How does Boolean Works in CoffeeScript?

JavaScript has "True or False" for Boolean but CoffeeScript has "On or Yes and Off or No" for the same.

13) Describe Interpolation of string in CoffeeScript.

Syntax is:
  1. # {...} which is same as Ruby

14) Describe mapping of an array in CoffeeScript.

By using map() function we can map an array in object. We can also use List Mapping for simple mapping as CoffeeScript directly supports it.

15) What is the use of Existential Operator?

  • To validate Existence of Variable.
  • For function chaining.
  • To use conditional assignment.

16) How compiler is helpful in CoffeeScript?

CoffeeScript compiler ensure that within lexical scope, all the variable should be properly declared.

17) What are the different type of loop in CoffeeScript?

CoffeeScript provide two types of loop:
  • One for iterating over an array.
  • One for iterating over the properties of an object.

18) What is the use of CoffeeScript chained comparison syntax?

CoffeeScript chained comparison syntax is used to know whether any given variable falls inside a given range. It also enables to chain the two comparisons together in a form that matches closely.

19) How Clone Function is useful?

Clone function is useful in creating completly new object by:
  • Creating a new object as the source object.
  • Copying all attributes from the source object to the new object.

20) Describe the use of destructing assignment.

In CoffeeScript destructing assignment is used to swap the variables by using array.

21) How you can detect and create missing function in CoffeeScript?

In CoffeeScript to etect and create missing function we use use the existential assignment operator (?=).

22) Can we bind parameters to properties in CoffeeScript?

Yes, CoffeeScript allows to bind parameters to properties by using the @ shorthand. It also allows to define class function.

23) Can we bind parameters to properties in CoffeeScript?

Yes, CoffeeScript allows to bind parameters to properties by using the @ shorthand. It also allows to define class function.

24) How can you replace a portion of strings with another value?

In CoffeeScript, we use Regular Expression to match and replace a portion of a string with another value.

25) Describe simple build system.

It is similar to Make and Rake but in CoffeeScript known as Cake. It is used for the tasks that build and test the CoffeeScript language.