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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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On 13.04.2016 18:08, Cai Gengyang wrote:
> 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.

That is still after exercise 13.

> 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

That is wrong.  You got the error because you did not pass an argument 
when invoking the script.  You could also say that you got the error 
because your script did not deal well with invocation without arguments.

Regards

	robert


-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

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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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