debug assignment

debug01.rb

list = {'yvr' => 'Vancouver', 
        'yba' => 'Banff', 
        'yyz' => 'Toronto', 
        'yxx' => 'Abbotsford', 
        'ybw' => 'Calgary'}

# Why is it returning nil instead of first element of the list above
puts list.first

debug02.rb

def average(numbers)
  sum = 0
  numbers.each do |num|
    sum += num.to_i.to_f
  end
  sum = sum / (numbers.length - numbers.count(nil)) unless numbers.size == 0
  if sum == sum.floor
    return sum.to_i
  else
    sum.to_f
  end
end

## TEST HELPER METHOD
def test_average(array=[])
  print "avg of #{array.inspect}:"
  result = average(array)
  p result
end

## TEST CODE
test_average([4,5,6]) # => 5
test_average([15,5,10]) # => 10

# Should treat string like number
test_average([15,'5',10]) # => 10

# Should show decimal value
test_average([10, 5]) # => 7.5 instead of just 7

# Watch out! Even tests can have bugs!
test_average([9, 5, 7])

# Empty set should return nil, not throw an error
test_average([]) # => nil

# Non-existent set should return nil
test_average() # => nil

# BONUS: Should ignore nils in the set
test_average([9,6,nil,3]) # => 6

debug03.rb

#def sum(list)
# sum = 0
# list.each do |ele|  
#   sum += ele
# end
#  sum
#end

def sum(list)
  list.inject(0){ |sum, numbers| sum + numbers}
end

list1 = [16,21,31,42,55]

# 1. The following should return 165 instead of an error
puts sum(list1)

# 2. How would you refactor it using an enumerable method other than each? Examples of enumerables: map, select, inject, reject, detect.

debug04.rb

def char_count(list)
  letters = {}
  list.each do |word|
    word.split('').each { |letter| letters.has_key?(letter) ? letters[letter] += 1 : letters[letter] =1}
  end
  letters = letters.sort_by {|a,b| b}
  letters.reverse!
  print letters
end

# Why the long face(error)? 
# 1. This should return count of each letter in the list

puts char_count(['apples', 'oranges', 'hipsters', 'are', 'same'])


# 2. What are the improvements you can do to above code?