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From: Iain Barnett on 20 Jul 2010 08:34
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


From: Luis on 20 Jul 2010 09:04
El 20/07/10 08:34, Iain Barnett escribi�:
> 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
>
>
>
>
the error is when you hit 'b'+enter, there are two character, character
'b' and the character 'enter' which do not is present in hash h

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From: Iain Barnett on 20 Jul 2010 10:01

On 20 Jul 2010, at 14:04, Luis wrote:
> the error is when you hit 'b'+enter, there are two character, character 'b' and the character 'enter' which do not is present in hash h
>
> --

ok, thanks. x.chomp! fixed it.

Iain


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