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Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>'

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Ok, it works now ! I was on exercise 15 (http://learnrubythehardway.org/book/ex15.html), not exercise 30 ... just named it ex30 randomly because I previously saved another file called ex15. 

CaiGengYangs-MacBook-Pro:GoatBoy CaiGengYang$ ruby ex30.rb ex30_sample.txt
Here's your file ex30_sample.txt:
This is stuff I typed into a file.
It is really cool stuff.
Lots and lots of fun to have in here.

Type the filename again: ex30_sample.txt
This is stuff I typed into a file.
It is really cool stuff.
Lots and lots of fun to have in here.

I realised that I got the error because I initially forgot to create the 2nd sample.txt file




On Wednesday, April 13, 2016 at 4:23:25 PM UTC+8, Sebastian Christ wrote:
> On 2016-04-12 22:34, Cai Gengyang <gengyangcai@gmail.com> wrote:
>  > What does "invoking the script without arguments" mean ? 
> 
> Are you sure that you've done all the exercises? You say you're now at Ex. 30,
> but obviously you didn't pay that much attention to Ex. 13, did you?
> 
> Regards,
> Sebastian
> 
> -- 
> Sebastian (Rudolfo) Christ
> http://rudolfochrist.github.io
> GPG Fingerprint: 306D 8FD3 DFB6 4E44 5061
>                  CE71 6407 D6F8 2AC5 55DD

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in `open': no implicit conversion of nil into String (TypeError)  from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-11 20:31 -0700
  Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Robert Klemme <shortcutter@googlemail.com> - 2016-04-12 08:09 +0200
    Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-12 22:34 -0700
      Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Sebastian Christ <rudolfo.christ@gmail.com> - 2016-04-13 10:23 +0200
        Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-13 09:08 -0700
          Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Robert Klemme <shortcutter@googlemail.com> - 2016-04-13 20:27 +0200
            Re: in `open': no implicit conversion of nil into String (TypeError) from ex30.rb:3:in `<main>' Cai Gengyang <gengyangcai@gmail.com> - 2016-04-14 21:59 -0700

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