destutter.rb

# This does more than you were asking for.
# Two fundtions:
# => get_array has the user input each array item
# => destutter has two conditions: the array and the mode
# If the mode is seq it will return the array with sequential
# duplicates removed. If the mode is unique it will return
# the array with all duplicates removed

def get_array
	r = []
	food=nil
	until food == ""
		puts "Feed me, Seymour! (blank to stop feeding): "
		food = gets.chomp
		r.push(food) unless food == ""
	end
	r
end

def destutter (ary, mode)
	r = []
	# user_input = nil // From a previous revision
	if mode == "seq"
		previous = ""
		ary.each do |x| 
			r.push(x) unless x == previous
			previous = x
		end
		r
	elsif mode == "unique"
		ary.uniq!
		ary
	else
		puts "ERROR: Expecting mode 'seq' or 'unique'. YOU LOSE."
	end
end

the_array = get_array
puts "Type 'seq' to eliminate sequential duplicates."
puts "Type 'unique' to eliminate all duplicates."
input = gets.chomp
destuttered = destutter(the_array, input)
puts destuttered