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#!/usr/bin/env perl
# Copyright (c) 2019 Christian Jaeger,
# This is free software. See the file that came bundled
# with this file.
use strict; use warnings; use warnings FATAL => 'uninitialized';
# find modules from functional-perl working directory (non-installed)
use Cwd 'abs_path';
our ($mydir, $myname); BEGIN {
my $location= (-l $0) ? abs_path ($0) : $0;
$location=~ /(.*?)([^\/]+?)_?\z/s or die "?";
($mydir, $myname)=($1,$2);
use lib "$mydir/../lib";
use Test::Requires qw(Moo);
# Comparison of imperative and functional approaches to some data
# container:
package ImperativePerson {
use Moo;
has name=> is=> 'ro';
has todo_items=> is => 'ro'; # the array itself is the mutable part
sub add_todo {
my ($self, $item)= @_;
push @{$self->{todo_items}}, $item;
package FunctionalPerson {
use FP::List;
use FP::Struct ["name", "todo_items"];
sub add_todo {
my ($self, $item)= @_;
$self->todo_items_update(sub { cons $item, $_[0] })
use Test::More;
sub testImperative {
my $p= ImperativePerson->new(name=> "Chris", todo_items=> []);
$p->add_todo ("buy bread");
$p->add_todo ("walk dog");
is_deeply $p->todo_items, ['buy bread', 'walk dog'];
use FP::Equal qw(is_equal); # using FP::Equal's `equal` but still
# reporting via Test::More
use FP::List;
sub testFunctional {
my $p= FunctionalPerson->new("Chris", null);
my $p2= $p->add_todo ("buy bread");
my $p3= $p2->add_todo ("walk dog");
is_equal $p3->todo_items, list('walk dog', 'buy bread');
is_equal $p2->todo_items, list('buy bread');
if ($ENV{RUN_TESTS}) {
} else {
require FunctionalPerl; import FunctionalPerl ":repl";
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