Procedures Ormap - Lecture Notes | Study Guide - Edubirdie

University:
University of California, Berkeley
Course:
COMPSCI 164 | Programming Languages and Compilers
Academic year:

2022
Views:

269

Pages:

3
Author:

5prinzg1s

andmap/foldr (andmap proc lst ...+) -> any proc : procedure? lst : list? Similar to map in the sense that proc is applied to each element of lst, but the result is #f if any application of proc produces #f, in which case proc is not applied to later elements of the lsts; and the result is that of proc applied to the last elements of the lsts; more specifically, the application of proc to the last elements in the lsts is in tail position with respect to the andmap call. If the lsts are empty, then #t is returned. Examples: > (andmap positive? '(1 2 3)) #t > (andmap positive? '(1 2 a)) positive?: contract violation expected: real? given: a > (andmap positive? '(1 -2 a)) #f > (andmap + '(1 2 3) '(4 5 6)) 9 (foldr proc init lst ...+) -> any/c proc : procedure? init : any/c lst : list? Like foldl, but the lists are traversed from right to left. Unlike foldl, foldr processes the lsts in space proportional to the length of lsts (plus the space for each call to proc). Examples: > (foldr cons '() '(1 2 3 4)) '(1 2 3 4) > (foldr (lambda (v l) (cons (add1 v) l)) '() '(1 2 3 4)) '(2 3 4 5)

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