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Latest Top 20 Ruby Interview Questions With Answers

Latest Top 20 Ruby Interview Questions With Answers

1. What Is Ruby Programming Language?
Ruby is a dynamic, reflective, general purpose, open source programming language that focuses on simplicity and productivity. Ruby has a mixed features of Perl, small talk, Eiffel, Ada and Lisp. Ruby was designed to create a new language which makes a balance with the functionality of Imperative languages.

2. What Are The Different Environment Variables Present In The Ruby?
Following are the different environment variables present in the Ruby:

3. Why Ruby Is Known As A Language Of Flexibility?
Ruby is known as a language of flexibility because it facilitates its author to alter the programming elements. Some specific parts of the language can be removed or redefined. Ruby does not restrict the user. For example, to add two numbers, Ruby allows to use + sign or the word 'plus'. This alteration can be done with Ruby's built-in class Numeric.

4. Explain About Float, Dig And Max?
Float class is used whenever the function changes constantly. It acts as a sub class of numeric. They represent real characters by making use of the native architecture of the double precision floating point.
Max is used whenever there is a huge need of Float.
Dig is used whenever you want to represent a float in decimal digits.

5. What Is The Use Of Global Variable $ In Ruby?
The global variable is declared in Ruby that you can access it anywhere within the application because it has full scope in the application. The global variables are used in Ruby with $ prepend.

6. Mention What Is The Difference Between A Gem And A Plugin In Ruby?
Gem: A gem is a just ruby code. It is installed on a machine, and it’s available for all ruby applications running on that machine.
Plugin: Plugin is also ruby code, but it is installed in the application folder and only available for that specific application.

7. What Is The Use Of Interpolation In Ruby?
Interpolation is a process of inserting a string into a literal. It is a very important process in Ruby. A string can be interpolated into a literal by placing a hash (#) within {} open and close brackets.

8. Explain About Garbage Collection Feature Of Ruby?
Garbage collection is a process of reclaiming the memory space. Ruby deletes unallocated and unused objects automatically. This feature can be controlled by applying proper syntax and program through ruby.
Ruby performs garbage collection automatically. Ruby is an object oriented language and every object oriented language tends to allocate many objects during execution of the program.

9. Overview Of Ruby Programming Language?
Ruby is a dynamic, open source programming language. It focuses on productivity and simplicity. The syntax is elegant which is natural to read and easy to write and use. The language is flexible, since it allows the developers alter freely all its parts. At will, one can remove essential parts and redefined. For instance , the symbol + can be redefined by the word ‘plus’ to one of the its classes – Numeric.
Ruby supports multiple programming paradigms, such as, functional, imperative, object oriented, relative. Dynamic memory management and dynamic type systems are additional features of Ruby.

10. What Is Rails?
Ruby on Rails is a web application framework. It is written in Ruby. Compare to other frameworks for web application, the big deal is the way Ruby on Rails does. A web application finished in days instead of weeks, it is noticed by the community. Maintenance and/or extension of messy and hard web applications is flexible with ruby rails.

11. What Is The Use Of Load And Require In Ruby?
In Ruby, load and require both are used for loading the available code into the current code. In cases where loading the code required every time when changed or every times someone hits the URL, it is suggested to use 'load'. It case of autoload, it is suggested to use 'require'.

12. What Is Rubygems In Ruby Programming Language?
RubyGems provides a standard format for distributing ruby programs and libraries. It works as a package manager for the Ruby programming language. RubyGems is now a part of the standard library from Ruby version 1.9.

13. Explain About Interpolation?
Interpolation is a very important process in Ruby. Interpolation is the process of inserting a string into a literal. There is only one way in which you can interpolate a string into a literal by placing a Hash (#) within {} open and close brackets. This refers to a new name to by referring to the copy of the original method.

14. Explain The Difference Between Nil And False In Ruby?
False is a boolean datatype 
Nil is not a data type 

15. Explain About Portability?
Ruby language can be ported to many platforms. Ruby programs can be ported to many platforms without any modification to the source code. This feature made the language very useful and highly used by many programmers worldwide. Some of the platforms used are DOS, UNIX, WINDOWS, etc.

16. Explain About Normal Method Class?
This function calls a method and it can take any number of arguments and expr. Make sure that you put an asterisk or an ampersand before the expression. Last expr argument can be declared with a hash without any braces. If you want to increase the size of the array value then make sure that you put an asterisk before expression. “::” can be used to separate the class from methods.

17. Explain About The Defined Operator?
Define operator defines whether a passed expression is defined or not. If the expression is defined it returns the description string or null if the expression is not defined. If a variable is defined it gets initialized. If method_call is defined as true then method also gets defined. This is also the same case with super and yield.

18. Explain About Ruby Names?
Classes, variables, methods, constants and modules can be referred by ruby names. When you want to distinguish between various names you can specify that by the first character of the name. Some of the names are used as reserve words which should not be used for any other purpose. A name can be lowercase letter, upper case letter, number, or an underscore, make sure that you follow the name by name characters.

19. List Out The Few Features Of Ruby?
Free format –
You can start writing from program from any line and column.
Case sensitive – The uppercase and lowercase letters are distinct.
Comments – Anything followed by an unquoted #, to the end of the line on which it appears, is ignored by the interpreter.
Statement delimiters- Multiple statements on one line must be separated by semicolons, but they are not required at the end of a line.

20. Mention What Is The Difference Between A Single Quote And Double Quote?
A single-quoted strings don’t process ASCII escape codes, and they don’t do string interpolation.

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