Ruby Sorting Arrays temporarily and then permanently

array_sort.rb

user_input = "foo,bar,you,know".split(',') # We use split to make an array from user input
user_input.count # this will display 4 because we store 4 values in our array

# Now we use the temp array sort method
user_input.sort

# To save the values back to the array you need to use !
user_input.sort!