From: Iain Barnett <iainspeed@...>
Date: 2010-07-20T21:34:15+09:00
Subject: undefined method `call' for nil:NilClass (NoMethodError)

Hello,

Just playing around with a few things in Ruby, and I'm wondering why the following script would throw an error? I'm using Ruby 1.9.1 on OSX 10.6

#!/usr/bin/env ruby -wKU

puts "Welcome"

h = {  'a' => lambda { puts "again again!" } ,
          'b' => lambda { puts "oh no!" }
        }

while true
  x = STDIN.getc
  break if x == 'q'
  h[x].call
end

$ ./getchar.rb
Welcome
a
again again!
./getchar.rb:12:in `<main>': undefined method `call' for nil:NilClass (NoMethodError)


$ ./getchar.rb
Welcome
b
on no!
./getchar.rb:12:in `<main>': undefined method `call' for nil:NilClass (NoMethodError)


Any help is much appreciated

Regards,
Iain