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This goes through the same steps as the functional version but doesn't use much functional programming (and so is probably more efficient):

#!/usr/bin/perl -w use strict; sub gen { my %list; @list{@_}= map [1], 0..$#_; return sub { my @next; for my $m ( keys %list ) { if( ! @next || $list{$m}[0] < $list{$next[0]}[0] ) { @next= $m; } elsif( $list{$m}[0] == $list{$next[0]}[0] ) { push @next, $m; } } my $ret= $list{$next[0]}[0]; for my $m ( @next ) { shift @{$list{$m}}; } for my $m ( keys %list ) { push @{$list{$m}}, $ret*$m; } return $ret; }; } @ARGV= (2,3,5) if ! @ARGV; my $iter= gen(@ARGV); print $iter->(), $/ while 1;

Ever notice that converting a functional program to a procedural one is a bit like doing a Fourier transform? (: I supposed I shouldn't be using a closure with such a claim, but they make convenient one-method objects.

- tye        


In reply to Re: Hamming Sequences and Lazy Lists (non-'functional' iterator) by tye
in thread Hamming Sequences and Lazy Lists by tall_man

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