Ruby On Rails Developer Interview Questions

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Ruby On Rails Developer interview questions shared by candidates

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Contract Ruby On Rails Software Engineer was asked...January 27, 2012

Describe a routine which returns the set of integers in {1..100} divisible without remainder by 3 but not by 9.

12 Answers

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(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

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Software Engineer (Ruby/Rails) was asked...March 5, 2015

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

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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?

Ruby On Rails Developer was asked...May 9, 2018

what is out put of: 1) a && b, 2) a ||= b, 3) a & b?

1 Answers

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1) bigger value will be returned, 2) b is assigned to a if a is nil or false, 3) Boolean value will be returned based on the value of a and b(if any of a or b is nil or false false will be returned Less

Ruby On Rails Developer was asked...December 18, 2010

What type of data structure would you use to implement auto-complete functionality where memory usage needs to be minimized?

1 Answers

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Use a trie

Ruby On Rails Developer was asked...November 30, 2021

experiencias pasadas, conocimientos, prueba tecnica muy basica

1 Answers

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di un resumen de mi experiencia y conocimiento, la prueba tecnica era mas que todo teorica en la que consultaban conceptos basicos de desarrollo. Less