NAME
    Seq::Iter - Generate a coderef iterator from a sequence of items, the
    last of which can be a coderef to produce more items

VERSION
    This document describes version 0.001 of Seq::Iter (from Perl
    distribution Seq-Iter), released on 2023-11-21.

SYNOPSIS
      use Seq::Iter qw(seq_iter);

     # generate fibonacci sequence
     my $iter = seq_iter(1, 1, sub { my ($index, $orig_seq, $gen_seq) = @_; $gen_seq->[0] + $gen_seq->[1] }); # => 1, 1, 2, 3, 5, 8, ...
     # ditto, shorter
     my $iter = seq_iter(1, 1, sub { $_[2][0] + $_[2][1] });

     # generate 5 random numbers
     my $iter = seq_iter(sub { my ($index, $orig_seq, $gen_seq) = @_; $index >= 5 ? undef : sprintf("%.3f", rand()) }); # => 0.238, 0.932, 0.866, 0.841, 0.501, undef, ...

     # randomly decrease between 0.1 and 0.4 then always return 0 after it reaches <= 0
     my $iter = seq_iter(3, sub { my ($index, $orig_seq, $gen_seq) = @_; $gen_seq->[0] <= 0 ? 0 : $gen_seq->[1]-(rand()*0.3+0.1)));

DESCRIPTION
    This module provides a simple (coderef) iterator which you can call
    repeatedly to get numbers specified in a sequence specification (list).
    The last item of the list can be a coderef which will be called to
    produce more items. The coderef item will be called with:

     ($index, $orig_seq, $gen_buf)

    where $index is a incrementing number starting from 0 (for the first
    item of the generated sequence), $orig_seq is the original sequence
    arrayref, and $gen_buf is an array containing generated items (most
    recent items first), capped at $BUFFER_SIZE items (by default 10).

VARIABLES
  $BUFFER_SIZE
FUNCTIONS
  seq_iter
    Usage:

     $iter = seq_iter(LIST); # => coderef

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Seq-Iter>.

SOURCE
    Source repository is at <https://github.com/perlancar/perl-Seq-Iter>.

SEE ALSO
    For simpler number sequence, see NumSeq::Iter. As of 0.006, the module
    supports recognizing fibonacci sequence.

    Other *::Iter modules.

AUTHOR
    perlancar <perlancar@cpan.org>

CONTRIBUTING
    To contribute, you can send patches by email/via RT, or send pull
    requests on GitHub.

    Most of the time, you don't need to build the distribution yourself. You
    can simply modify the code, then test via:

     % prove -l

    If you want to build the distribution (e.g. to try to install it locally
    on your system), you can install Dist::Zilla,
    Dist::Zilla::PluginBundle::Author::PERLANCAR,
    Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two
    other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps
    required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE
    This software is copyright (c) 2023 by perlancar <perlancar@cpan.org>.

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

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Seq-Iter>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.