Undefined method sort for Enumerator
iterator, methods, ruby, sorting
Solution
Your problem is here: `@currency = coins.map`
If you call `map` without a block, it will return an `Enumerator`. What is it you wanted to map here? If there's nothing you want to do with the values of `coins`, just assign `@currency = coins.sort.reverse` and save yourself the `sort!` and `reverse` steps.
Problem
I implemented the Greedy algorithim in ruby using the following code: ``` class Greedy def initialize(unit, total, *coins) @total_coins1 = 0 @total_coins2 = 0 @unit = unit @total = total @reset_total = total @currency = coins.map @currency.sort! @currency = @currency.reverse unless @currency.include?(1) @currency.push(1) end end def sorter @currency.each do |x| @pos = @total / x @pos = @pos.floor @total_coins1 += @pos @total -= x * @pos puts "#{@pos}: #{x} #{@unit}" end puts "#{@total_coins1} total coins" end end ``` When I try to run the code: ``` x = Greedy.new("cents", 130, 50, 25, 10, 5) ``` I get an error: ``` NoMethodError: undefined method `sort!' for #<Enumerator: [50, 25, 10, 5]:map> from /Users/Solomon/Desktop/Ruby/greedy.rb:9:in `initialize' from (irb):2:in `new' from (irb):2 from /Users/Solomon/.rvm/rubies/ruby-1.9.3-p125/bin/irb:16:in `<main>' ``` Being very new to Ruby, I have no idea what this means, nor how to fix it, because `[50, 25, 10, 5].sort!` is a perfectly valid method... How do I fix this error?