Ruby on Rails interview questions – RoR test from PeopleCentric

One of the recruiting companies that I have collaborated with in the past decided to publish many of theirs IT tests . You can find, among others, a Ruby on Rails test. Enjoy 🙂

Ruby on Rails Interview questions – update

Most of Google searches that hit my blog are about ‘ruby on rails interview questions‘.

Responding to this popular request 😉 , I will post 3 more questions that are related.

1. What type of data would you use to represent currency?

2. Why is it not a good practice to use float for currency?

3. Explain the following behaviour:

~$ ruby --version
ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]
~$ irb
irb(main):003:0> (10.12*100).to_i
=>; 1011

The answer – in my next post .

Ruby on Rails interview questions – part 2

Continuing the “RoR interview questions” sequel(part one here) , these are some general Rails concepts and technologies questions. Enjoy :).

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Ruby on Rails interview questions – Part one – Ruby


This is the first article on the RoR interview questions. The purpose is not necessary to be used to ‘cheat’ on an interview, but to present some tricky things in Ruby and RoR.

Some (the majority) of the questions do not yet have answers. I will be filling the blanks.. soon 🙂

What is the duck typing?

The duck typing can be seen as one of the ruby implementation of polymorphism. The principle is: “If it walks like a duck and quacks like a duck, I would call it a duck.”. Below is an example of this principle (from

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