Re: map vs foreach

you want to iterate with side-effects, then you should use a proper for or foreach loop. Somewhere there's a quote (possibly apocryphal but wait! [2]) from Larry Wall on a map vs foreach thread: "That being said, I'd never grep someone in a void context myself." He actually wasn

Re: map vs foreach

On Tue, 30 Sep 2014 16:38:24 -0700 SSC_perl wrote: > On Sep 30, 2014, at 4:08 PM, Shawn H Corey wrote: > > code like you will have to read it after an all-night party > > (some day, you will). > > Those days are over, but point taken! ;) They're never over but they do get farther apart.

Re: map vs foreach

On 09/30/2014 05:08 PM, SSC_perl wrote: Is the output of these two lines equivalent? map { $hash->{$_} = shift @record } @{$self->{'FIELDNAMES'}}; $hash->{$_} = shift @record foreach @{$self->{'FIELDNAMES'}}; They appear to be in my testing, but I'd like to make sure.

Re: map vs foreach

On Sep 30, 2014, at 4:19 PM, David Precious wrote: > So, e.g.: > > my %fields = map { $_ => shift @record } @{$self->{'FIELDNAMES'}}; > > ... would make sense, because you're using map to produce the data you > want, rather than using it instead of a for loop. Thanks, David. That was an

Re: map vs foreach

On Sep 30, 2014, at 4:08 PM, Shawn H Corey wrote: > code like you will have to read it after an all-night party > (some day, you will). Those days are over, but point taken! ;) Thanks, Frank SurfShopCART https://github.com/surfshopcart/surfshop -- To unsubscribe, e-mail: beginners-uns

Re: map vs foreach

On Tue, 30 Sep 2014 14:08:14 -0700 SSC_perl wrote: > Is the output of these two lines equivalent? > > map { $hash->{$_} = shift @record } @{$self->{'FIELDNAMES'}}; > > $hash->{$_} = shift @record foreach @{$self->{'FIELDNAMES'}}; [...] > Is one more appropriate than the other in a s

Re: map vs foreach

On Tue, 30 Sep 2014 14:08:14 -0700 SSC_perl wrote: > Is the output of these two lines equivalent? > > map { $hash->{$_} = shift @record } @{$self->{'FIELDNAMES'}}; > > $hash->{$_} = shift @record foreach @{$self->{'FIELDNAMES'}}; > > They appear to be in my testing, but I'd like to

Re: map vs foreach

Is asking a preference-based question appropriate for a beginners list appropriate? Question for you: Have you updated your software to have a more modern look and feel or does it still resemble 1995? I ask because, in your own words, you said "or is it simply a styling difference?". Feedback for

map vs foreach

Is the output of these two lines equivalent? map { $hash->{$_} = shift @record } @{$self->{'FIELDNAMES'}}; $hash->{$_} = shift @record foreach @{$self->{'FIELDNAMES'}}; They appear to be in my testing, but I'd like to make sure. Is one more appropriate than the other in

Re: odd benchmark result, map vs foreach

then autovivifying >> it. It isn't necessarily the map vs. foreach that is causing your >> difference. I think for your benchmark to be accurate you are going to >> have to control the actions taken in the loop, otherwise they affect the >> accuracy of your benchmark. > >

Re: odd benchmark result, map vs foreach

Wiggins d'Anconia wrote: Your benchmark isn't controlled. In the first instance you are doing a ++ on what amounts to a scalar getting autovivified, in the second instance you are assigning a pair of values to a list then autovivifying it. It isn't necessarily the map vs.

Re: odd benchmark result, map vs foreach

John W. Krahn wrote: Scott R. Godin wrote: Interesting .. I would have thought that map would be faster, but it appears that foreach is, in this instance. curious.. :) [snip] To be equivalent the foreach sub should use assignment instead of postincrement (which is also faster.) Interest

Re: odd benchmark result, map vs foreach

Scott R. Godin wrote: > Interesting .. I would have thought that map would be faster, but it > appears that foreach is, in this instance. curious.. :) > > > 4:52pm {193} localhost:/home/webadmin/>$ perl bench.pl > Benchmark: running Foreach, Map for at least 5 CPU seconds... >Foreach: 9 wall

Re: odd benchmark result, map vs foreach

And don't run the two test too soon after eachother, your operating system will cache some data. Also run all the tests multiple times. Wijnand -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]

Re: odd benchmark result, map vs foreach

e_bill_ship rkh_quantity rkp_quantity rmh_quantity > rmp_quantity rbh_quantity rbp_quantity ship_on_account > shipping_id_number order_number }; > }, } > ); > Your benchmark isn't controlled. In the first instance you are doing a ++ on what amounts to a scalar getting autov

odd benchmark result, map vs foreach

Interesting .. I would have thought that map would be faster, but it appears that foreach is, in this instance. curious.. :) 4:52pm {193} localhost:/home/webadmin/>$ perl bench.pl Benchmark: running Foreach, Map for at least 5 CPU seconds... Foreach: 9 wallclock secs ( 5.24 usr + 0

Re: map vs foreach

Dear Michael, I am wrong. [SHAME] The output of Benchmark is slowest first... whereas I intuitively thought it would be fastest first. All my conclusions are therefore wrong, although the differences in speed are still surprising. Results may change depending on the version of Perl, I am using

RE: map vs foreach

Thanks heaps Jonathon and Paul for your help. :) Regards, Michael S. E. Kraus Software Developer Wild Technology Pty Ltd ___ ABN 98 091 470 692 Level 4 Tiara, 306/9 Crystal Street, Waterloo NSW 2017, Australia Telephone 1300-13-9453 | Facsimile 1300-88-9453 http://w

Re: map vs foreach

Dear Michael, None of the above. All your code is calling length() twice per loop. The best way to write what you want is: my $max_length = 0; for my $datum (keys %data) { my $length = length $datum; if ($max_length < $length) { $max_l

Re: map vs foreach

On Mon, Nov 29, 2004 at 10:15:52AM +1100, Michael Kraus wrote: > Which is better to use, a for/foreach loop or map function when doing > some basic comparisons and assignments? > > E.g. > > for my $datum (keys %{$rh_vars}) { > $max_length = length($datum) if length($datum) > $max_length; >

map vs foreach

G'day... Which is better to use, a for/foreach loop or map function when doing some basic comparisons and assignments? E.g. for my $datum (keys %{$rh_vars}) { $max_length = length($datum) if length($datum) > $max_length; } OR map { $max_length = ($max_length > length($_) ? $max_length