Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
While we're on the topic of benchmarking, I'd just like to, for the hell of it, add the worst possible answer to this question:
map { $code .= "\$hash{$_} = 1;\n" } @array; eval "$code";
And now for a little program, borrowed from httptech:
use Benchmark; my @array = qw(a b c d e f g h i j k l m n o p q r s t u v w z y z); my %hash; timethese(10000, { 'btrott' => sub { @hash{@array} = (1) x @array; }, 'plaid' => sub { my $code map { $code .= "\$hash{$_} = 1;\n" } @array; eval "$code"; } });
Benchmark: timing 10000 iterations of btrott, plaid... btrott: 1 wallclock secs ( 0.56 usr + 0.00 sys = 0.56 CPU) plaid: 23 wallclock secs (22.07 usr + 0.06 sys = 22.13 CPU)
Don't know why i threw this in. Guess I just didn't want to waste the effort:)

In reply to RE: RE: Re: Array to Hash by plaid
in thread Array to Hash by Anonymous Monk

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 or How to display code and escape characters are good places to start.
Log In?

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

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (4)
As of 2022-10-07 15:43 GMT
Find Nodes?
    Voting Booth?
    My preferred way to holiday/vacation is:

    Results (30 votes). Check out past polls.