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\DOC mapfilter
\TYPE {mapfilter : ('a -> 'b) -> 'a list -> 'b list}
\SYNOPSIS
Applies a function to every element of a list, returning a list of results
for those elements for which application succeeds.
\KEYWORDS
list.
\FAILURE
Fails if an exception not of the form {Failure _} is generated by any
application to the elements.
\EXAMPLE
{
# mapfilter hd [[1;2;3];[4;5];[];[6;7;8];[]];;
val it : int list = [1; 4; 6]
# mapfilter (fun (h::t) -> h) [[1;2;3];[4;5];[];[6;7;8];[]];;
Warning: this pattern-matching is not exhaustive.
Here is an example of a value that is not matched:
[]
Exception: Match_failure ("", 24547, -35120).
}
\SEEALSO
filter, map.
\ENDDOC
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