4.1.2. Representing Expressions
Named let
«Named let» is a variant of let that has the form
(let var bindings body)The <bindings> and <body> are just as in ordinary let, except that <var> is bound within <body> to a procedure whose body is <body> and whose parameters are the variables in the <bindings>. Thus, one can repeatedly execute the <body> by invoking the procedure named <var>. For example, the iterative Fibonacci procedure (section 1.2.2) can be rewritten using named let as follows:
(define (fib n)
(let fib-iter ((a 1)
(b 0)
(count n))
(if (= count 0)
b
(fib-iter (+ a b) a (- count 1)))))Modify let->combination of exercise 4.6 to also support named let.
Nobody's finished this exercise yet. You'll be the first!