From: Calvin Bornhofen <calvin.bornhofen@...>
Date: 2013-01-21T05:29:10+09:00
Subject: Re: question about string concatenation

Hello,

the thing you are puzzled about happens because you did not tell Ruby 
what you want to do with the string "[". You just placed a number after 
it (the error message should have told you, that the parser encountered 
a "tInteger" (your 9), but was expecting $end (what means that something 
ending the line would be appropriate).

Did your confusion come from string interpolation? It looks somewhat 
similar to what you wrote; it would look something like "[#{9.to_s}]", 
where the to_s is fully optional, since everything in between the { and 
} will be converted to a string.

Regards,
Calvin
On 20.01.2013 21:08, David Richards wrote:
> I'm puzzled about why the following happens (I'm using v1.9.3):
>
> s = "[" 9.to_s "]"  # error