Debug Exercise

debug01.rb

require 'pry'

list = {'yvr' => 'Vancouver', 'yba' => 'Banff', 'yyz' => 'Toronto', 'yxx' => 'Abbotsford', 'ybw' => 'Calgary'}
binding.pry 
# Why is it returning nil instead of first element of the list above

p list.first

debug02.rb

require 'pry'

def average(numbers=nil)
  # binding.pry
  return nil if ( numbers == nil || numbers == [] )

  sum = 0
  divisor = numbers.size
  numbers.each do |num|
    # binding.pry
    sum += num.to_f
    divisor -= 1 if num == nil 
  end

  sum / divisor
  
end
 
## TEST HELPER METHOD
def test_average(array = nil)
  print "avg of #{array.inspect}:"
  result = average(array)
  puts 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
 
# binding.pry
# 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

require 'pry'

def sum(list)
  total = 0
  list.each do |ele|
     
    total += ele
  end
  total
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 a Ruby list method?
 

debug04.rb

require 'pry'
def char_count(list)
  @letters = Hash.new(0)
  list.each do |word|
    # binding.pry
    word.split('').each { |letter| @letters[letter] += 1 }
  end
  @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?

error_example

def method1
  method2
end
 
def method2
  method3
end
 
def method3(a=nil)
  puts a
end
 
method1