Max Pleaner MaxPleaner

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Frontend Development

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Backend Architectures

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#Getting Started

##Webpage:

<html>
<head>
    <title>Testing with Ruby and Selenium WebDriver</title>
</head>
 
<body bgcolor="antiquewhite">

	data:text/html, <style type="text/css">.e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div class="e" id="editor"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("editor");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>
	<!--
	For other language: Instead of `ace/mode/ruby`, Use

	Markdown -> `ace/mode/markdown`
	Python -> `ace/mode/python`
	C/C++ -> `ace/mode/c_cpp`
	Javscript -> `ace/mode/javascript`
	Java -> `ace/mode/java`
	Scala- -> `ace/mode/scala`

	# Depth-first search (DFS) is an algorithm for traversing or
	# searching a tree, tree structure, or graph. One starts at
	# the root (selecting some node as the root in the graph case)
	# and explores as far as possible along each branch before backtracking.
	#
	# A graph can be represented by its adjacency matrix G,
	# where G[i][j] == 1 if there is an edge between
	# vertices i and j and 0 otherwise.
	#
	# Below Graph in diagram http://i.imgur.com/sV1UzUn.png

	require 'rubygems'
	require 'bundler/setup'
	require 'aws-sdk'

	# NOTE: require ENV[...]
	# export AWS_ACCESS_KEY_ID='...'
	# export AWS_SECRET_ACCESS_KEY='...'
	# export AWS_REGION='ap-northeast-1'

	s3 = AWS::S3.new

	#simplest ruby program to read from arduino serial,
	#using the SerialPort gem
	#(http://rubygems.org/gems/serialport)

	require "serialport"
	require "pony"

	#params for serial port
	port_str = "/dev/tty.supershoesBT1-SPP" #may be different for you
	#port_str = "/dev/tty.usbmodemfd121" #may be different for you

	# -- immutable: string --

	require 'benchmark'

	class Request
	def initialize(first, last, city, state, country)
	@hash =
	{
	'first' => first,
	'last' => last,