CODEWITHSUNDEEP
ruby
user3719047
user3719047

Reputation: 39

Range loop works by itself, but not inside an until loop

def bubble_sort(arr)
    sorted = false
    until sorted
        sorted = true
        (0...arr.length-2).each do |i|
            if arr[i] > arr[i+1]
                arr[i], arr[i+1] = arr[i+1], arr[i]
                sorted = false
            end
        end
    end
    arr
end

bubble_sort([4,6,2,8,1])

The following is the error message:

(eval):367: (eval):367: compile error (SyntaxError)
(eval):359: syntax error, unexpected kDO_COND, expecting kEND
        (0...arr.length-2).each do |i|
                                  ^
(eval):367: syntax error, unexpected kEND, expecting $end

I don't understand why it is saying unexpected kEND

Upvotes: 0

Views: 36

Answers (1)

Martin Konecny
Martin Konecny

Reputation: 59611

This appears to be a bug in Ruby 1.8.7 - replacing do/end with {}:

    (0...arr.length-2).each do |i|
        if arr[i] > arr[i+1]
            arr[i], arr[i+1] = arr[i+1], arr[i]
            sorted = false
        end
    end

and

    (0...arr.length-2).each { |i|
        if arr[i] > arr[i+1]
            arr[i], arr[i+1] = arr[i+1], arr[i]
            sorted = false
        end
    }

fixes it.

Upvotes: 1

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