Rails Developer Interview Questions
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Rails Developer interview questions shared by candidates
Describe a routine which returns the set of integers in {1..100} divisible without remainder by 3 but not by 9.
12 Answers↳
(1..100).select { |x| x%3 == 0 && x%9 != 0
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1) start from number = 3 Loop while(number <= 100) 2) display number 3) number = number+3, display number 4) number = number+6 Loop Less
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put those integers into an array, pick every third element, out of which discard every third element. Less
This was a pair programming session with a Ruby engineer. They allow you to use your own laptop which was great but you only get 30 minutes to finish the problem with working unit tests. I think they re-use this pair programming problem so I'm not going to divulge details here. But it wasn't a particularly hard problem, they just want you to see how you code and test. Do not forget to write unit tests! Ideally you would develop it in a TDD fashion.
2 Answers↳
I wrote failing unit tests to determine the API first and then kept writing code until the tests succeeded. Less
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Do they expect use of rspec, minitest or just simple assert methods for tdd?
What type of data structure would you use to implement auto-complete functionality where memory usage needs to be minimized?
1 Answers↳
Use a trie
If we have 8 same little balls, but one of them is less weight. How may times do we need to weigh them to define which ball is less weight?
1 Answers↳
6 times
Prueba tenica mediate plataforma online y segunda prueba tecnica compartiendo pantalla
1 Answers↳
realizando los ejercicios solicitados
How did you become a Ruby on Rails Developer?
1 Answers↳
I was a WordPress PHP developer at the time and I discovered that with Ruby on Rails you have more control over data flow and the Rails routing engine. (interview did not seem to understand what I meant by data flow). I explained from a data flow perspective that Rails allows for custom routes and custom routes with their own actions, unlike WordPress, which I was working with at the time. (Interviewing began wanting to debate me that you cannot compare one with the other). I answered I was not doing a compare and contrast, but walking him through how I went from PHP WordPress to being a Ruby on Rails developer. Less