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(SRFI-1 Length Append etc): Add count.

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Kevin Ryde 2003-05-03 22:27:14 +00:00
parent 004fe2c802
commit e508c8630c
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doc/ref/srfi-modules.texi
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@ -381,6 +381,20 @@ first containing the first elements of each lists and the second
containing the second elements of each lists, and so on. containing the second elements of each lists, and so on.
@end deffn @end deffn
@deffn {Scheme Procedure} count pred lst1 @dots{} lstN
Return a count of the number of times @var{pred} returns true when
called on elements from the given lists.
@var{pred} is called with @var{N} parameters @code{(@var{pred}
@var{elem1} @dots{} @var{elemN})}, each element being from the
corresponding @var{lst1} @dots{} @var{lstN}. The first call is with
the first element of each list, the second with the second element
from each, and so on.
Counting stops when the end of the shortest list is reached. At least
one list must be non-circular.
@end deffn
@node SRFI-1 Fold and Map @node SRFI-1 Fold and Map
@subsection Fold, Unfold & Map @subsection Fold, Unfold & Map