hash to differentiate type and tokens

sarvan has asked for the wisdom of the Perl Monks concerning the following question:

Hi there, I want to differentiate between the types and tokens in hash.. for e.g if i have

my $str='finding related pages on the world wide web the web'; 
my %hash=split(/\s+/,$str);
[download]

here, how can i get access to the tokens of hash and types of hash.. basically for duplication i need this.

for eg. "the" and "web" in $str are repeated. so in such cases tokens and types helps.

so, need to know how to use them..

Comment on hash to differentiate type and tokens Download Code

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Re: hash to differentiate type and tokens by johngg (Canon) on Jul 13, 2011 at 07:08 UTC
I'm guessing as well but do you mean something like `knoppix@Microknoppix:~$ perl -E ' > $str = q{finding related pages on the world wide web the web}; > $hash{ $_ } ++ for split m{\s+}, $str; > printf qq{%-10s - %d\n}, $_, $hash{ $_ } > for sort keys %hash;' finding - 1 on - 1 pages - 1 related - 1 the - 2 web - 2 wide - 1 world - 1 knoppix@Microknoppix:~$` [download] I hope I've guessed correctly and that this is helpful. Cheers, JohnGG	[reply] [d/l]
Re: hash to differentiate type and tokens by Anonymous Monk on Jul 13, 2011 at 06:32 UTC
What does that mean? A hash does not have types or tokens, so what are you talking about? Shot in the dark, have you read Tutorials► Data Types and Variables► Data Type: Hash	[reply]
Re^2: hash to differentiate type and tokens by sarvan (Sexton) on Jul 13, 2011 at 06:42 UTC
Hi, By types and tokens i meant, if i have a word "the" multiple times in a array i need to process it as many times as it is in the array. But in hash it avoids duplicates by having the token of each word. if a word "the" appears six times in a hash. then type of "the" is only one. but the token of "the" is 6.. Is it correct what i m speaking	[reply]
Re^3: hash to differentiate type and tokens by Anonymous Monk on Jul 13, 2011 at 07:05 UTC
A hash associates one key with one value, so this is what you have in %hash `my $str='finding related pages on the world wide web the web'; my %hash=split(/\s+/,$str); use DDS; Dump( \%hash ); __END__ $HASH1 = { finding => 'related', pages => 'on', the => 'web', wide => 'web' };` [download] What do you want %hash to contain?	[reply] [d/l]
Re^4: hash to differentiate type and tokens by sarvan (Sexton) on Jul 13, 2011 at 07:25 UTC
Re^5: hash to differentiate type and tokens by Anonymous Monk on Jul 13, 2011 at 08:10 UTC
Some notes below your chosen depth have not been shown here
Re: hash to differentiate type and tokens by sundialsvc4 (Abbot) on Jul 13, 2011 at 21:14 UTC
Perl has a few “tricks up its sleeve” to make some coding tasks a little easier. For example, if you simply write, `$somehash{'foo'}++`, then the key associated with `'foo'` will be an integer that gets incremented ... even if no such key exists previously! Perl simply “does what you mean.” It automagically creates a key if necessary, then increments it. So, if you want to use a hash to count the number of occurrences of words in a string (a very common objective...) Perl, by design, makes that trivial.	[reply]


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