rubystringsortingdebuggingnomethoderror

Why am I getting NoMethodError in this code in ruby?

So,my question was, Why am I getting NoMethodError regarding sort method in function next_bigger when being called ?

Here's the code :

class String
    def sort
        self.chars.sort.join
    end
end

def next_bigger n
    s = n.to_s
    return -1 if n <= 10 || s == s.sort.reverse #This line resulting NoMethodError
    (2..n).each do |p|
        x = (s[0...-(p)] +  s[-(p)..-1].sort).to_i
        return x if x > n
    end
    -1
end

p next_bigger 12
Solution

  • You're not getting the NoMethodError on the line you think you are. It's happening 2 lines later. The other place where you call sort.

    x = (s[0...-(p)] +  s[-(p)..-1].sort).to_i

    If you index a range of a string outside it's bounds, you get nil

    ""[1..-1] #=> nil

    You get NoMethodError because you're calling sort on that nil.