ruby challenge wk 7

gistfile1.rb

# Gene Sequencing

# Given an input array and a test array, create a method that takes in
# two arrays as inputs, named 'input' and 'test,' respectively.
# 'input' is an array of any number of letters
# 'test' is an array of 4 letters 
# The method returns 'match!' if the 'test' array is found inside the 
# 'input' array and returns 'no match =(' if the 'test' array is not found

# Bonus: Try to make the script work even if your test sequence is reversed



# Example) 
# input = ['G', 'A', 'T', 'T', 'A', 'C', 'A']
# test = ['G', 'A', 'T', 'T']

# the method should return 'match!'






# Example 2) 
# input = ['G', 'A', 'T', 'T', 'A', 'C', 'A']
# test  = ['A', 'A', 'A', 'A']

# the method should return 'no match =('





# Example 3)
# input = ['G', 'A', 'T', 'T', 'A', 'C', 'A']
# test = ['G', 'A', 'C', 'A']

# the method should return 'no match =('





# Bonus Example)
# input = ['G', 'A', 'T', 'T', 'A', 'C', 'A']
# test = ['T', 'T', 'A', 'G']

# the method should return 'match!'





# here's some code to get you started:

# input = ['G', 'A', 'T', 'T', 'A', 'C', 'A']
# test = ['G', 'A', 'T', 'T']

# def gene_test(input_array, test_array)
#    <your code goes here>
# end

# gene_test input, test




























# SOLUTIONS:

# My lazy, brute-force solution
#
# def gene_test(input_array, test_array)
#   # test_array = test
#   result = 'no match =('
#   input_array.count.times do |index|
#     if index < (input_array.count - test_array.count + 1)
#       if input_array[index] == test_array[0] && input_array[index + 1] == test_array[1] && input_array[index + 2] == test_array[2] && input_array[index + 3] == test_array[3]
#         result = 'match!'
#       elsif input_array[index] == test_array[3] && input_array[index + 1] == test_array[2] && input_array[index + 2] == test_array[1] && input_array[index + 3] == test_array[0]
#         result = 'match!'
#       end
#     end
#   end
#   puts result
# end




# A much more elegant, Ruby-ish solution, inspired by Raghu
#
# def gene_test(input_array, test_array)
#   if input_array.join.include?(test_array.join) || input_array.join.include?(test_array.reverse.join)
#     puts "match!"
#   else
#     puts "no match =("
#   end
# end