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Hi DarrenSol
Wonderful answers has been given, but maybe this little example / question could also "say" something.
If I give the following:

teacher students professor students school class teacher desk table chalk borad class school teacher
And I ask that for these:
1. print out all the words, without repeating any, 2. print out all the repeated words only, 3. print out the number of times each words is seen and probably an illustration this with an histogram.
How would you do these.

Let me answer QnS 1. and 2., allow you to figure question 3 and try your hands on other solution WITHOUT USING HASH
use strict; use warnings; my %hash; while(<DATA>){ chomp; $hash{$_}++ for split; } print join $/ => sort keys %hash; print $/,$/, join $/ => grep {$_ if $hash{$_} > 1} sort keys %hash; __DATA__ teacher students professor students school class teacher desk table chalk borad class school teacher
  1. borad chalk class desk professor school students table teacher
  2. class school students teacher
That brings me to a statement I read in Programming Perl a while a go that 'Until you start thinking in terms of hashes, you arenít really thinking in Perl.'

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re: why use a hash instead of an array by 2teez
in thread why use a hash instead of an array by DarrenSol

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