From: Alexander Schofield <pcs3@...>
Date: 2001-10-28T12:04:29+09:00
Subject: [ruby-talk:23660] Re: How to get a String to interpolate itself?

You could try:
var = 99
str = 'line with var to interpolate: #{var}'
a = eval("\"#{str}\"")
puts a

or simply:
var = 99
str = 'line with var to interpolate: #{var}'
eval "puts \"#{str}\""

hope this helps.

Phil Tomson wrote:
> 
> I'm trying to read lines from a file that might contain something like:
> 
> Here is a line with a variable to interpolate: #{var}
> 
> Now when I read it in like:
> 
>   var = 99
>   File.foreach("junk.rbt") {|line|
>     puts line
>   }
> 
> of course I get the same line in the file with the #{var} in it.
> I'd like to get:
> Here is a line with a variable to interpolate: 99
> 
> I suspect there must be a way to do this since using "" causes
> interpolation, how can I get an existing String to interpolate itself?
> 
> Phil