```ruby
# Shortest String

# I worked on this challenge myself.

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

#Your Solution Below

def shortest_string(list_of_words)

  list_of_words.min { |x,y| x.length <=> y.length }
end
  shortest_string(["1","3","10","25"])
  
```

Include method for shortest string
user
```ruby
# Shortest String

# I worked on this challenge myself.

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

#Your Solution Below

def shortest_string(list_of_words)

  list_of_words.min { |x,y| x.length <=> y.length }
end
  shortest_string(["1","3","10","25"])
```
assistant