All,
For any of you that missed it, Pugs version 6.2.2 was released yesterday. To help spread advocacy, I want to start answering questions here at the Monastery with both p5 and p6 answers much like merlyn did way back in the day. The trouble is that my p6 fu isn't very strong yet, so I have been practicing. This is my latest attempt which is a port of this.

Stop doubting and start believing. 

use v6;

sub lazy_merge (@list is rw) returns Ref {
    my $last = 0;

    my $by_n = sub { my ($n, $k) = (shift(@_), 0); return { @_[0] ?? $
+k += $n :: $k } };
    for @list { $_ = $by_n( $_ ) }

    return sub {
        my $low;
        for ( @list ) {
            my $val = $_();
            $val = $_( 'next' ) if $val <= $last;
            $low = $val if (! defined $low) || ($val < $low);
        }
        return $last = $low;
    };
}

my $end   = @*ARGS[0] // 22;
my @prime = (2, 3, 5);
my $next  = lazy_merge( @prime );
for 1..$end { say $next() };

[download]
As it has been added as an example in the Pugs distribution, you can always see the latest version here

Cheers - L~R

It is worth mentioning that there very well may be a more p6ish way to write this. It is usually necessary to crawl before running.

In reply to Perl6 Infinite Lazy Lists by Limbic~Region

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