Wouldn't it be better to build it as you read?

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Post #174,060 by drewk 9/13/04 11:30:27 PM Reply	Wouldn't it be better to build it as you read? Instead of reading in the whole file and splitting it, wouldn't it make more sense as you read each chunk to look for the newline, take whatever is in your sting up to that and push it into the hash, delete it from the front of your string and keep reading? If the file is truly "large" I wouldn't want to read then whole thing in then split it. === Implicitly condoning stupidity since 2001.
Post #174,063 by tuberculosis 9/13/04 11:46:47 PM 8/21/07 6:31:41 AM Reply	Its not large - its small and the only api I see is "read n bytes" or "read n bytes starting at m". No line oriented interface that I can see. Which is annoying as hell, so I'll just read it all. Anyhow, if the file exceeds 20k I will be amazed. That was lovely cheese. --Wallace, The Wrong Trousers Edited by tuberculosis Aug. 21, 2007, 06:31:41 AM EDT Expand All History
Post #174,066 by broomberg 9/14/04 12:07:31 AM 9/14/04 12:10:08 AM Reply	Perl is line oriented by default Use the <FILE_HANDLE> construct. While Ben will do this in one line, here is how I would handle it. If you NEED to open the file (rather than STDIN): \nuse strict;\nopen (IN,"file.dat") or die "Can't open file - $!";\nmy %hash;\nwhile (<IN>){\n chomp;\n my ($key,$data) = split(' ',$_,2);\n $hash{$key} = $data;\n}\nclose (IN);\n Edited by broomberg Sept. 14, 2004, 12:10:08 AM EDT Expand All History

Perl - storing a hash in a file to re-read later - (tuberculosis) - (26) - Aug. 21, 2007, 06:31:37 AM EDT

Wouldn't it be better to build it as you read? - (drewk) - (2) - Sept. 13, 2004, 11:30:27 PM EDT

Its not large - its small - (tuberculosis) - (1) - Aug. 21, 2007, 06:31:41 AM EDT

Perl is line oriented by default - (broomberg) - Sept. 14, 2004, 12:10:08 AM EDT

This wheel has been invented already :-) - (ben_tilly) - (22) - Sept. 14, 2004, 02:12:40 AM EDT

<fawn>Wonderful post</fawn> - (pwhysall) - (1) - Sept. 14, 2004, 02:16:29 AM EDT

<preen /> -NT - (ben_tilly) - Sept. 14, 2004, 02:28:23 AM EDT

I am so glad I gave up on tying my programming skills... - (inthane-chan) - (7) - Sept. 14, 2004, 12:51:16 PM EDT

Why? -NT - (deSitter) - (6) - Sept. 14, 2004, 12:58:01 PM EDT

Because there's no way I could match that answer. -NT - (inthane-chan) - (5) - Sept. 14, 2004, 03:34:03 PM EDT

But that isn't programming - (ben_tilly) - (4) - Sept. 14, 2004, 05:23:03 PM EDT

Nice to see a teacher/craftsman in action. - (ChrisR) - (3) - Sept. 14, 2004, 05:30:39 PM EDT

A good thing for my spare time you mean? - (ben_tilly) - Sept. 14, 2004, 05:41:16 PM EDT

Why? -NT - (deSitter) - (1) - Sept. 14, 2004, 09:03:38 PM EDT

Jack of all languages... - (ChrisR) - Sept. 14, 2004, 10:58:00 PM EDT

I figured it had - one more quickie question - (tuberculosis) - (11) - Aug. 21, 2007, 06:35:59 AM EDT

Error checking remains a best practice - (ben_tilly) - (10) - Sept. 14, 2004, 02:06:31 PM EDT

Agree - (tuberculosis) - (9) - Aug. 21, 2007, 06:37:51 AM EDT

You lucky duck. - (FuManChu) - Sept. 14, 2004, 06:24:06 PM EDT

What do you mean by plists? - (ben_tilly) - (6) - Sept. 14, 2004, 06:30:32 PM EDT

I meant NextStep style plists - (tuberculosis) - (5) - Aug. 21, 2007, 06:38:24 AM EDT

Do you mean kind of like this? - (ben_tilly) - (3) - Sept. 14, 2004, 09:18:19 PM EDT

Pretty close - (tuberculosis) - (2) - Aug. 21, 2007, 06:40:25 AM EDT

Ah - (ben_tilly) - (1) - Sept. 15, 2004, 01:28:44 PM EDT

One True Data Format - (tuberculosis) - Aug. 21, 2007, 06:40:37 AM EDT

Big River Books - rofl - (deSitter) - Sept. 15, 2004, 01:53:32 PM EDT

ICLRPD (new thread) - (Meerkat) - Sept. 15, 2004, 12:10:08 AM EDT

Mother Hubbard got me covered, like Sarah Lee on her cherry pie.
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