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July 3, 2019 20:36
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ruby_questions.rb
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| Ruby Interview Questions | |
| Ruby | |
| What is a class? | |
| What is an object? | |
| How is the method lookup performed in Ruby? *** | |
| What's the purpose of method missing and how does it work? Tiene la idea | |
| How do you support multi inheritance in Ruby? | |
| What's the difference between include and extend? | |
| Difference between private and protected method? | |
| Why would you use a lambda or a proc? Explain the differences OK | |
| What's duck typing? ***** | |
| What are the disadvantages of Ruby compared to other languages? | |
| How do you manage private gems in some project? | |
| What is a PORO? OK | |
| What is the difference between == and === | |
| What is Enumerable in Ruby? What do you use for? OK | |
| Difference between map and each? OK | |
| Why would you use freeze in Ruby? OK | |
| Rails | |
| What is RACK? OK | |
| What do you know about HTTP2? **** | |
| What's the purpose of strong parameters? OK | |
| How are the assets managed in Rails? | |
| What type of cache do you know or have you used? *** | |
| What is ActionController? | |
| How does Active Record work? | |
| What is a scope and what's the difference with a Instance method or class method? | |
| What is the difference between optimistic and pessimistic locking ***** | |
| What is the difference between SQL injection and CSS injection? **** | |
| Why do we use HTTPS over HTTP? | |
| General | |
| What is a code smell? | |
| Why you should avoid fat controllers? How do you refactor that? | |
| AWS / Lambda | |
| What are the pros and cons of serverless? | |
| From the web perspective how do you connect lambda with the external world ? | |
| How your lambda function can access your other aws resources ? | |
| How do you troubleshoot & debug your lambda code? | |
| Capybara | |
| Capybara supports javascript? | |
| What is a driver in capybara? | |
| Can you access to any page using Capybara? | |
| What is a headless browser? | |
| Capybara can inject javascript? | |
| Which are the matching strategies that Capybara uses? | |
| CSS | |
| What are the advantages of CSS3? | |
| What is Flex? *** | |
| Situations | |
| * Let's say you are building a bet system where odds changes at any time, how would you implement it? | |
| * Your database has 200 million of rows in one table, how would you add a column there? What strategy would you implement it? | |
| * Why would you recommend Rails over Java? | |
| * You need to update and perform some calculations in a column of 200 million of clients, what would you do it? | |
| * If you have a betting system, how would you handle race conditions? | |
| * Your app works 24/7, how do you handle the databases changes? | |
| * You need to integrate data from CSV files, SQL Server database, XML files into a single table in your rails app, what would you do? ** |
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