# Longest String

# I worked on this challenge [by myself, with: ].

# longest_string is a method that takes an array of strings as its input
# and returns the longest string
#
# +list_of_words+ is an array of strings
# longest_string(list_of_words) should return the longest string in +list_of_words+
#
# If +list_of_words+ is empty the method should return nil


# Your Solution Below
def longest_string(list_of_words)
  longest = list_of_words[0]
  list_of_words.each do |word|
  	if list_of_words.empty? 
  		return nil
  	elsif word.length > longest.length
  		longest = word
  	end 
  end 
  return longest
end