Tinnova first set of exercises

tinnova.rb

require 'set'

# Solved exercises 
# Roberto Ruiz
# For Tinnova

# 1:
input = [{ "name": 'eggs', "price": 1 }, { "name": 'coffee', "price": 9.99 }, { "name": 'rice', "price": 4.04 }]

def sort_hash_by_price(ary)
  ary.sort_by { |x| x[:price] }
end

puts "----- Exercise 1 output"
puts sort_hash_by_price(input)

#2:

def present_elements(ary1, ary2)
  (ary1 - ary2).to_s
  # to_s for cosmetic purposes on console
end

puts "----- Exercise 2 output"
puts present_elements([1,2,3,4], [1,2,3,4])
puts present_elements([1,2,3,4], [5,6,7,8])
puts present_elements([1,2,3,4], [3,4,5,6])


#3:
@data = Hash.new

#method to add as requested
def add_hash(hash)
  if @data[hash[:parent]].nil?
    @data[hash[:parent]] = Set.new
  end
  @data[hash[:parent]].add(hash[:category])
end

# Search method as requested, with error message
def search_by_parent(parent_letter)
  if @data[parent_letter].nil?
    "Parent '#{parent_letter}' does not exist."
  else
    @data[parent_letter].to_a.join(", ")
  end
end



add_hash({:category=>"A", :parent=>"Z"})
add_hash({:category=>"B", :parent=>"A"})
add_hash({:category=>"C", :parent=>"A"})
add_hash({:category=>"D", :parent=>"V"})

puts "----- Exercise 3 output"
puts search_by_parent("A")
puts search_by_parent("H")

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