laziness, impatience, and hubris PerlMonks

### Re^3: Challenge: Another Infinite Lazy List

by tlm (Prior)
 on Mar 18, 2005 at 02:01 UTC ( #440607=note: print w/replies, xml ) Need Help??

in reply to Re^2: Challenge: Another Infinite Lazy List
in thread Challenge: Another Infinite Lazy List

I am confused. Where is the "infinite lazy list"?

In the implementation I posted, a variable like

```my \$lazy235 = challenge( 2, 3, 5 );
is, effectively, an infinite lazy list. One can repeatedly extract an arbitrarily long prefix from it, using take, or repeatedly find its n-th element with something like:
```sub nth {
my \$ll = shift;
my \$n = shift;
die "Invalid argument: \$n\n" if \$n < 0;
return \$n == 0 ? head( \$ll ) : nth( tail( \$ll ), \$n - 1 );
}
For example, the following:
```my @first_50 = take( 50, \$lazy235 );
my @again    = take( 50, \$lazy235 );

print "@first_50\n\n@again\n\n";

for ( map int( rand( 1000 ) ), ( 1 .. 5 ) ) {
printf "%3d %d\n", \$_, nth( \$lazy235, \$_ );
}
prints out something like
```0 2 3 4 5 6 8 9 10 12 14 15 16 18 20 21 22 24 25 26 27 28 30 32 33 34
+35 36 38 39 40 42 44 45 46 48 50 51 52 54 55 56 57 58 60 62 63 64 65
+66

0 2 3 4 5 6 8 9 10 12 14 15 16 18 20 21 22 24 25 26 27 28 30 32 33 34
+35 36 38 39 40 42 44 45 46 48 50 51 52 54 55 56 57 58 60 62 63 64 65
+66

347 474
857 1168
530 723
994 1355
579 789

the lowliest monk

Replies are listed 'Best First'.
Re^4: Challenge: Another Infinite Lazy List
by tall_man (Parson) on Mar 18, 2005 at 07:19 UTC
My reply was not meant to be an "infinite lazy list". It was a reply to another poster who had an interative solution, giving another way to do it. I perfer the lazy list solutions myself.

Create A New User
Node Status?
node history
Node Type: note [id://440607]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (4)
As of 2020-10-30 02:17 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
My favourite web site is:

Results (277 votes). Check out past polls.

Notices?