Top 15 Effective Ruby Interview Questions

Ruby Interview Questions

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Top 15 Effective Ruby Interview Questions

Looking for Ruby Interview Questions, your research ends-up here!! Here are the Top 15 Effective Ruby Interview Questions.

Ruby is an interpreted, high-level, general-purpose programming language. It was designed and developed in the mid-1990s by Yukihiro “Matz” Matsumoto in Japan. Ruby is dynamically typed and uses garbage collection. It supports multiple programming paradigms, including procedural, object-oriented, and functional programming. According to the creator, Ruby was influenced by Perl, Smalltalk, Eiffel, Ada, Basic, and Lisp. Source: Wikipedia

Ruby Interview Questions

Q1. Define Ruby programming Language?

Ruby is a dynamic, reflective, general-purpose, open-source programming language that focuses on simplicity and productivity. Ruby is a pure object-oriented programming language with simple in appearance and complex inside.

Q2. Can you explain the different features of Ruby Programming Language?

Below is the list of features offered by Ruby:

  1. Ruby is open-source and is freely available on the Web
  2. Ruby is a general-purpose and interpreted programming language.
  3. Ruby is a true object-oriented programming language.
  4. Ruby is a server-side scripting language very much similar to Python and PERL.
  5. Ruby can be used to write Common Gateway Interface (CGI) scripts.
  6. Ruby can be embedded into Hypertext Markup Language (HTML).
  7. Ruby has a clean and easy syntax that allows a new developer to learn very quickly and easily.
  8. Ruby has a similar syntax to that of many programming languages such as C++ and Perl.
  9. Ruby is very much scalable and big programs written in Ruby are easily maintainable.
  10. Ruby has a rich set of built-in functions, which can be used directly into Ruby scripts.

Q3. What are different Ruby editors?

Below are different editors for Linux and Windows:

  1. You can use Notepad or Edit plus on Windows.
  2. You can use VIM on Linux
  3. RubyWin is a Ruby Integrated Development Environment (IDE) for Windows.
  4. Ruby Development Environment IDE for windows users.

Q4. What are the different variables in Ruby?

Ruby has four types of variables:

  1. Local Variables: Local variables are the variables that are defined in a method. Local variables are not available outside the method.
  2. Instance Variables: Instance variables are available across methods for any particular instance or object. That means that instance variables change from object to object.
  3. Class Variables: Class variables are available across different objects. A class variable belongs to the class and is a characteristic of a class.
  4. Global Variables: Class variables are not available across classes. If you want to have a single variable, which is available across classes, you need to define a global variable.

Q5. What is the command to get installed Ruby version in your system?

The command to get installed Ruby version in your system is
Ruby –v

Must Read: Top 10 Effective Maven Interview Questions

Q6. What are the different operators used in Ruby?

The different operators in Ruby are:

  1. Unary operator
  2. Arithmetic operator
  3. Bitwise operator
  4. Logical operator
  5. Ternary operator

Q7. What are the different class libraries used in Ruby?

The different class libraries used in Ruby are:

  1. Text processing
  2. CGI Programming
  3. Network programming
  4. GUI programming
  5. XML programming

Q8. What are the different data types used in Ruby?

The different data types used in Ruby are:

  1. Numbers
  2. Strings
  3. Symbols
  4. Hashes
  5. Arrays
  6. Booleans

Click here for: Official Website of Ruby

Q9. What are the different iterators used in Ruby?

The different iterators used in Ruby are:

  1. each iterator
  2. times iterator
  3. up to and down to iterator
  4. step iterator
  5. each_line iterator

Q10. What is the use of Super?

Super is used to call the parent classes initialize method from the child initialize method. Super has the following forms of implementation.

  1. Calling only the super means
  2. Call the parents to initialize

Let us move to some advanced level of Ruby Interview Questions

Q11. How can you declare a block in Ruby?

In Ruby, the code in the block is always enclosed within braces ({}). You can invoke a block by using the yield statement.

Q12. What are the levels of method access control for classes in Ruby?

There are three levels of method access control for classes:

  1. Public Methods: It can be called by all objects and subclasses of the class in which they are defined in.
  2. Protected Methods: It can be only accessible to objects within the same class.
  3. Private Methods: It is accessible in the same instance.

Q13. How does the symbol differ from the string?

  1. Multiple symbols representing a single value are identical while this is not possible with the Strings.
  2. Symbols and string are used interchangeably by various developers and You can consider Symbols as faster & immutable strings.
  3. Once a string is used up it is marked for cleaning by the garbage collector but it is not cleaned up immediately and it cannot be reused.
  4. Symbols live for the duration of the session and it can be reused again but it can lead to increased memory usage.

Q14. What is an interpolation in Ruby Programming Language?

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 by referring to the copy of the original method.

Q15. What is the difference between NIL and FALSE in Ruby?

The differences between NIL and FALSE in Ruby are:

  1. FALSE is a boolean data type, whereas NIL is not
  2. NIL cannot be a value, whereas a FALSE can be a value
  3. A method returns true or FALSE in case of a predicate, otherwise, NIL is returned
  4. NIL is an object for NilClass, whereas FALSE is an object of for FalseClass

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