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def fibonacci(n)
  n <= 1 ? 1 : fibonacci(n - 1) + fibonacci(n - 2)
end

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(1..100).each {|i| print i; print  ' fizz' if i%3 == 0; print ' buzz' if i%5 ==0; puts}

# recursive
def fizzbuzz(n = 1)
  if n < 101
    print "#{i}: "
    print "Fizz" if 0 == i % 3
    print "Buzz" if 0 == i % 5
    print "\n"
    fizzbuzz(n + 1)  

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# https://codility.com/demo/results/demoKSSE8R-5B3/
# A small frog wants to get to the other side of the road
# two solutions, this one gets 33% of scores:

def solution(x, y, d)
    y % d > 0 ? ((y - x) / d) + 1 : (y - x) / d
end

# this gets 100% scores:
def solution(x, y, d)

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a = 95800
b = 217519
c = 414560
d = 422481
a**4 + b**4 + c**4 == d**4 # => true

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def combinations(array)
  m = array.length
  (1...2**m).map do | n |
    (0...m).select { | i | n[i] == 1 }.map { | i | array[i] }
  end
end

def calculate_combinations(comb_array, target_sum=15)
  combinations(comb_array).map {|a| [a, a.inject(:+)]}.select {|v| v if v.last == target_sum}
end

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# just in case you work in a server were you do not have package groups defined. RHEL / CentOS
# yum groupinstall 'Development Tools'
yum -y install autoconf automake binutils bison flex gcc gcc-c++ gettext libtool make patch pkgconfig redhat-rpm-config rpm-build rpm-sign

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punctuation = %w{; = - _ . , ? ! $}
letters = [('a'..'z'), ('A'..'Z')].map { |i| i.to_a }.flatten
"#{punctuation.sample}#{(0...10).map { letters[rand(letters.length)] }.join}#{rand(1000)}"

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#!/usr/bin/env ruby
#
#  WSREP_CLUSTER_SIZE Plugin
#
# $ ./wsrep_cluster_size.rb -w 50 -c 75
#

require 'rubygems'
require 'mysql2'

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Exception while simulating the effect of invoking '/documents/update' 
Error
 Error: can't append to array using string field name [$]
    at Error (<anonymous>)
    at Function.LocalCollection._findModTarget (http://localhost:3000/packages/minimongo/modify.js?e7f02f0df0bff9f0b97236f9548637b7ede1ac74:90:15)
    at Function.LocalCollection._modify (http://localhost:3000/packages/minimongo/modify.js?e7f02f0df0bff9f0b97236f9548637b7ede1ac74:50:38)
    at LocalCollection._modifyAndNotify (http://localhost:3000/packages/minimongo/minimongo.js?d21efb753206850b6ada27b1fc327307eb2f2b9c:428:19)
    at LocalCollection.update (http://localhost:3000/packages/minimongo/minimongo.js?d21efb753206850b6ada27b1fc327307eb2f2b9c:394:12)
    at m.(anonymous function) (http://localhost:3000/packages/mongo-livedata/collection.js?2240f86c7b1195971d25f481e4a6c31da43bc0c1:378:36)
    at http://localhost:3000/packages/livedata/livedata_connection.js?ff27a501d94ef196d150a04e346edbcbdcccdb1a:537:25

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require 'formula'

def mysql_installed?
  `which mysql_config`.length > 0
end

class Php5.2.17 < Formula
  url 'http://ca2.php.net/distributions/php-5.2.17.tar.gz'
  homepage ''
  md5 '04d321d5aeb9d3a051233dbd24220ef1'