[plt-scheme] [ANN] Heist: a Scheme interpreter in Ruby

Matthias wrote:

>> ... you might find it worthwhile to peruse the relevant chapter of  
>> > my PL book, PLAI (www.plai.org), or the superior EoPL  
>> > (www.google.com).
> 
> Shriram's being coy. PLAI is every bit as good as EOPL. I know! He  
> started from my lectures  :-)  -- Matthias

Both are worthwhile for this purpose, but I would recommend PLAI first, 
as it uses lambdas to construct its continuations, and then EOPL, which 
uses a data structure representation of continuations (leaving the 
lambda representation to an exercise). The data structure representation 
is better suited for implementation in languages lacking functions as 
first-class values, but it's harder to understand. --PR