Question

I’m writing a program that’s supposed to rank and sort contenders in a competition.

# Defining class. Also sorts the array elements in ascending order.
class Dancer
attr_reader :couplenumber
attr_reader :scores
def initialize(couplenumber,scores)
@couplenumber=couplenumber
@scores=scores.sort
end 
end

# Opening file, and sorting into array. Also splits with ",".
results = File.open("danceresult.txt", "r+")
dancescores=[]
results.each do |result|
scores = result.split(',').map(&:to_i) 
couplenumber = scores.shift
dancescores << Dancer.new(couplenumber, scores)
end
dancescores.each do |dancers|
  dancers.scores
  # Prints to screen.
  puts "Couple No. #{dancers.couplenumber} got "\
       "a minimum score of #{dancers.scores[3]} or better. "\
       "Their sum is: #{dancers.scores[0..3].inject(:+)}"
end

I want the sum Their sum is: #{dancers.scores[0..3].inject(:+)} to take only those who have the lowest minimum score. So if we have five contenders, two of them get minimum score of 2, and the other three gets a minimum score of 4, then the “sum part” should only take the contenders with a minimum score of 2. Is it possible without having to rework all of the code, and if so, what is the easiest way to do it?

Answer 1

First establish what the minimum score is:

min_score = dancescores.map{|d| d.scores[3]}.min

Then add a conditional before your print:

dancescores.each do |dancer|
  # Prints to screen if the couple has the min_score
  if dancer.scores[3] == min_score
    puts "Couple No. #{dancer.couplenumber} got "\
       "a minimum score of #{dancer.scores[3]} or better. "\
       "Their sum is: #{dancer.scores[0..3].inject(:+)}"
  end
end

Or you can use select to handle only those dancers with the min_score like so:

dancescores.select{|d| d[3] == min_score}.each do |dancer|
  puts "Couple No. #{dancer.couplenumber} got "\
     "a minimum score of #{dancer.scores[3]} or better. "\
     "Their sum is: #{dancer.scores[0..3].inject(:+)}"
end