Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

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


In reply to Re^3: Challenge: Another Infinite Lazy List by tlm
in thread Challenge: Another Infinite Lazy List by Limbic~Region

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others rifling through the Monastery: (6)
As of 2024-03-28 12:33 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found