I was surprised by the lack of such a function in List::MoreUtils recently. There is natatime, but it returns an iterator rather than using a callback.
I wonder how much speed you'd gain by replacing $f->($a,$b) with &$f. Another advanced feature for the collection!
It would be a nice bonus if you $a and $b were aliases to the args like with map.
sub map_pairs(&@) {
my $cb = shift;
my $caller = caller();
my $ap = do { no strict 'refs'; \*{$caller.'::a'} };
my $bp = do { no strict 'refs'; \*{$caller.'::b'} };
local *$ap;
local *$bp;
my @res;
while (@_) {
*$ap = \shift;
*$bp = \shift;
push @res, &$cb;
}
return @res;
}
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|