occurence.rb

# readFile sets up a new file right away by calling writeFile
# then stores the file as readfile and returns the formatFile method on the readfile
def readFile
  writeFile
  file = File.open(File.expand_path File.dirname(__FILE__)  + "/output.txt")
  readfile = file.read
  file.close
  readfile.formatFile
 end

# writeFile creates a file containing 1 million random numbers
def writeFile
  array = []
  1000000.times{ array << rand(10) }
  fname = "output.txt"
  file = File.open(fname, "w") # a = append, w = wipe
  file.puts array
  file.close
end

# formatFile formats the file into a sorted array of integers
class String
  def formatFile
    self.gsub(/[^0-9]\s/, ' ').split(' ').map {|e| e.to_i}.sort
  end
end
# occurence returns the most frequently occuring number from the file
# and outputs a string such as:
                            #=> The number 5 accounted for 10.3% of the 1,000,000 items.
class Array
  def occurence(n)
    occurence = ((self.count(n) / (self.size).to_f) * 100).round(2)
    size = self.size.to_s.reverse.gsub(/...(?=.)/,'\&,').reverse
    puts "The number #{n} accounted for #{occurence}\% of the #{size} items."
  end
end

readFile.occurence(2)