use strict;
use warnings;
use Test::More;

my @data = ('1.0', 'hello', 0);

sub is_string_in {
    my $number_to_find = shift;
    return 0 < (grep { $_ eq $number_to_find } @_);
}
my $is_string_in = \&is_string_in;

ok('hello'->$is_string_in(@data));
ok(is_string_in('hello' => @data));

ok(not 1->$is_string_in(@data));
ok(not is_string_in(1 => @data));

ok(0->$is_string_in(@data));
ok(is_string_in(0 => @data));


use Scalar::Util qw(looks_like_number);
sub is_number_in {
    my $number_to_find = shift;
    return unless looks_like_number($number_to_find);
    return 0 < (grep { looks_like_number($_) and $_ == $number_to_find } @_);
}
my $is_number_in = \&is_number_in;

ok(not 'hello'->$is_number_in(@data));
ok(not is_number_in('hello', @data));

ok(1->$is_number_in(@data));
ok(is_number_in(1, @data));

ok(0->$is_number_in(@data));
ok(is_number_in(0, @data));

done_testing;