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improve description of andmap' and ormap'

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Based on suggestions from Dan Grossman and Ryan Culpepper
This commit is contained in:
Matthew Flatt 2011-08-26 09:47:17 -06:00
parent 71b500b49f
commit 85790b6611
1 changed files with 19 additions and 6 deletions
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25
collects/scribblings/reference/pairs.scrbl
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@ -289,7 +289,15 @@ Applies @racket[proc] to the elements of the @racket[lst]s from the
@defproc[(andmap [proc procedure?] [lst list?] ...+)
any]{
Similar to @racket[map], except that
Similar to @racket[map] in the sense that @racket[proc] is applied to
each element of racket[lst], but
@margin-note{The @racket[andmap] function is actually closer to
@racket[foldl] than @racket[map], since @racket[andmap] doesn't
produce a list. Still, @racket[(andmap f (list x y z))] is equivalent
to @racket[(and (f x) (f y) (f z))] in the same way that
@racket[(map f (list x y z))] is equivalent to @racket[(list (f
x) (f y) (f z))].}
@itemize[
@ -304,20 +312,25 @@ Similar to @racket[map], except that
]
If the @racket[lst]s are empty, then @racket[#t] is returned.}
If the @racket[lst]s are empty, then @racket[#t] is returned.
@mz-examples[
(andmap positive? '(1 2 3))
(andmap positive? '(1 2 a))
(andmap positive? '(1 -2 a))
(andmap + '(1 2 3) '(4 5 6))
]
]}
@defproc[(ormap [proc procedure?] [lst list?] ...+)
any]{
Similar to @racket[map], except that
Similar to @racket[map] in the sense that @racket[proc] is applied to
each element of racket[lst], but
@margin-note{To continue the @racket[andmap] note above,
@racket[(ormap f (list x y z))] is equivalent to @racket[(or (f x) (f
y) (f z))].}
@itemize[
@ -333,13 +346,13 @@ Similar to @racket[map], except that
]
If the @racket[lst]s are empty, then @racket[#f] is returned.}
If the @racket[lst]s are empty, then @racket[#f] is returned.
@mz-examples[
(ormap eq? '(a b c) '(a b c))
(ormap positive? '(1 2 a))
(ormap + '(1 2 3) '(4 5 6))
]
]}
@defproc[(for-each [proc procedure?] [lst list?] ...+)