Web Development ➔ Ruby Developer Job Interview Questions and Answers

Ruby Developer interview preparation guide for freshers and experienced professionals. Explore these number of Ruby Developer frequently asked questions(FAQs) extracted from many job interviews

☆ Tell me how can you declare a block in Ruby?
☆ Do you know about Dig, Float and Max?
☆ Explain me what is the purpose of RJs in Rails?
☆ Tell me what is Mixin in Rails?
☆ What is interpolation in Ruby?
☆ Tell us the types of variables available in Ruby Class?
☆ Tell me what is Rails Migration?
☆ Do you know when self.up and self.down method is used?
☆ Tell me what is Rails Active Record in Ruby on Rails?
☆ Explain me the log that has to be seen to report errors in Ruby Rails?
☆ What is the difference between a single quote and double quote?
☆ Tell me how you can list all routes for an application?
☆ Can you list out the few features of Ruby?
☆ Please explain the three levels of access control for Ruby methods?
☆ Tell me what is the function of garbage collection in Ruby on Rails?
☆ Can you please explain what is the difference between String and Symbol?
☆ Explain me what is the role of Rails Controller?
☆ Tell me what is Polymorphic Association in Ruby on Rails?
☆ Do you know what are the types of caching used in rails, what are they?
☆ Tell me what is the difference between calling super and calling super()?
☆ What is the difference between a gem and a plugin in Ruby?
☆ Tell us what is the difference between redirect and render in Ruby on Rails?
☆ Tell me what is ORM (Object-Relationship-Model) in Rails?
☆ What is the difference between Procs and Blocks?
☆ Tell us how would you implement hash in Ruby internally?
☆ Tell me how do you remove nil values in array using ruby?
☆ Do you know how Ruby looks up a method to invoke?
☆ What is a class library in Ruby?
☆ Please explain what are the positive aspects of Rails?
☆ Do you know what is Cross-Site Request Forgery (CSRF) and how Rails is protected against it?
☆ Tell me how you define Instance Variable, Global Variable and Class Variable in Ruby?
☆ Tell me in Ruby code, often it is observed that coder uses a short hand form of using an expression like array.map(&:method_name) instead of array.map { |element| element.method_name }. How this trick actually works?
☆ Please explain the role of thread pooling in relation to the thread lifecycle in Ruby?
☆ Explain me what is the difference between concern and application_controller.rb in ruby on rails?
☆ Tell me how would you freeze an object in Ruby? Can you provide a simple example?
☆ What is the difference in scope for these two variables: @@name and @name?
☆ Do you know what is the defined operator?
☆ Do you know what is sweeper in Rails?
☆ Tell me how you can create a controller for subject?
☆ Do you know what is “Yield” in Ruby on Rails?
☆ Tell me what does ruby name refers to?
☆ Tell me what is the difference between Ruby 1.9 and Ruby 2.0?
☆ Tell me what are blocks and procs?
☆ Please explain what are some advantages of using Ruby?
☆ Tell us in Ruby, it explains about the defined operator?
☆ Explain me what are the limits of Ruby on Rails?
☆ Tell me what is the difference between the Observers and Callbacks in Ruby on Rails?
☆ Can you explain me how Rails implements Ajax?
☆ Explain me what is the naming convention in Rails?
☆ Explain me what is the difference between Symbol and String?
☆ Please explain each of the following operators and how and when they should be used: ==, ===, eql?, equal?
☆ Tell me an array [1,2,34,5,6,7,8,9], product it using a method?
☆ Please explain what is MVC and why do we use it?
☆ As you know ruby provides four types of variables. List them and provide a brief explanation for each?
☆ What is the Notation used for denoting class variables in Ruby?
☆ Tell me what is the difference between calling super() and super call?
☆ Explain how you can run Rails application without creating databases?
☆ Tell me what is the command to create a migration?
☆ Tell me what is the role of sub-directory app/controllers and app/helpers?
☆ Tell me what is Ruby on Rails?
☆ Explain me what the difference is between false and nil in Ruby?
☆ Tell me how Symbol is different from variables?
☆ Can you list out what can Rails Migration do?
☆ Tell me what is the difference between Active support’s “HashWithIndifferent” and Ruby’s “Hash” ?
☆ Do you know what is rake in Rails?
☆ Tell us what is the difference between Dynamic and Static Scaffolding?
☆ Tell me how can we define Ruby regular expressions?
☆ What is the difference between put and putc statement?
☆ What is the syntax for Ruby collect Iterator?
☆ What is the difference extend and include?
☆ Tell me the role of modules and mixins in Ruby?
☆ Explain me what is the function of ORM in Ruby on Rails?
☆ Tell me can you call a private method outside a Ruby class using its object?
☆ Tell us what is class libraries in Ruby?

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