/ 
Scalar-Induce-0.05
River stage zero No dependents
/ Scalar::Induce

NAME

Scalar::Induce - Unfolding scalars

VERSION

version 0.05

SYNOPSIS

my @reversed = induce { @$_ ? pop @$_ : void undef $_ } [ 1 .. 10 ];

my @chunks = induce { (length) ? substr $_, 0, 3, '' : void undef $_ } "foobarbaz";

FUNCTIONS

All functions are exported by default.

induce

This function takes a block and a scalar as arguments and then repeatedly applies the block to the value, accumulating the return values to eventually return them as a list. It does the opposite of reduce, hence its name. It's called unfold in some other languages.

void

This is a utility function that always returns an empty list (or undefined in scalar context). This makes a lot of inductions simpler.

ACKNOWLEDGEMENTS

Aristotle Pagaltzis came up with this idea (http://use.perl.org/~Aristotle/journal/37831). Leon Timmermans re-implemented it in XS and uploaded it to CPAN.

AUTHOR

Leon Timmermans <leont@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2009 by Leon Timmermans.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.