【SICP练习】119 练习3.50

练习3-50

原文

Exercise 3.50. Complete the following definition, which generalizes stream-map to allow procedures that take multiple arguments, analogous to map in section 2.2.3, footnote 12.

(define (stream-map proc . argstreams) (if (<??> (car argstreams)) the-empty-stream (<??> (apply proc (map <??> argstreams)) (apply stream-map (cons proc (map <??> argstreams))))))

代码

(define (stream-map proc . argstreams) (if (stream-null? (car argstreams)) the-empty-stream (cons-stream (apply proc (map stream-car argstreams)) (apply stream-map (cons proc (map stream-cdr argstreams))))))
;Value: stream-map

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