From: Hal Fulton <hal9000@...>
Date: 2005-02-08T10:54:47+09:00
Subject: Re: Delayed string interpolation

Navindra Umanee wrote:
> Hal Fulton <hal9000@hypermetrics.com> wrote:
> 
>>   def interp(x,y)
>>     "The sum of #{x} and #{y} is #{x+y}"
>>   end
>>
>>   str = interp(210,27)  #  "The sum of 210 and 27 is 237"
> 
> 
> Unless I'm mistaken, this recomputes the whole string every time
> interp is called.  I wanted to compute the common parts of the string,
> cache it somewhere, and then compute the rest in another context.
> 
> Hence, a 2-step interpolation.

Yes, I'm sure there are some efficiency concerns. I've never
measured the performance in a case like this.

I wonder if it would be worthwhile to expose the internal
method which does interpolation? I've thought of this in
the past, but never seriously enough for an RCR. I think
that would be "prettier" than an explicit eval.

It would, of course, either have to operate in the current
binding or have a binding passed in.


Hal