scheme like
- Lisp in Small Pieces, Queinnec
- The Scheme Machine, Robert Burger 1994
bundle installbundle exec ruby ./repl.rb
>> (cdddr (list 1 2 3 4 5))
#> (4.0 5.0)
>> (cons 4 5)
#> (4.0 . 5.0)
>> (((lambda (a) (lambda (b) (list a b))) 1) 2)
#> (1.0 2.0)
>> ; we don't have a global env yet
>> (set! double (lambda (x) (list x x)))
#> function|#<Proc:0x00007f621dc76768 /home/jonathan/code/denver/bootstrap/evaluator.rb:60>
>>
>> (double 3)
#> (3.0 3.0)
>>
>> (double (double 4))
#> ((4.0 4.0) (4.0 4.0))
>> (set! pairup (lambda (v) (cons v v)))
#> function|#<Proc:0x00007f7bc2f4a390 /home/jonathan/code/denver/bootstrap/evaluator.rb:69>
>>
>> (pairup 3)
#> (3.0 . 3.0)