count_in_list.rb

# Method name: count_in_list(list, item_to_count)
# Inputs:      1. a list of anything, 2. an item for us to count in the list
# Returns:     The number of times our item is contained in the input list
# Prints:      Nothing
#
# For example,
#   count_in_list([1,2,3], 1)  == 1
#   count_in_list([1,2,3], -1) == 0
#   count_in_list([1,1,1], 1)  == 3

# --- NOTE ---
# Ruby has a built-in method to do this, but the purpose of this kata is
# to write it yourself.
#
# See: http://www.ruby-doc.org/core-2.1.2/Array.html#method-i-count

def count_in_list(list, item_to_count)
	count = 0
	list.each do |item|
		if item == item_to_count then count+=1 end
	end

	count
end

if __FILE__ == $0
  p count_in_list([1,2,3], 1)  == 1
  p count_in_list([1,2,3], -1) == 0
  p count_in_list([1,1,1], 1)  == 3
  p count_in_list(["hi","hello","heya"], "hi")  == 1
  p count_in_list(["hi",6,:hola], :hola)  == 1  
end