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uniq

Note! This site is about Perl 6.
If you are looking for a solution for the current production version of Perl 5, please check out the Perl 5 tutorial.

The UNIX uniq command drops the duplicate values from it input and prints out the result. Usually it is used in a pipe so it receives file rows and prints them on the screen (or passes them to the next command in the pipe chain).

In Perl 6 we have a uniq function that receives a list of values and returns the same list after dropping any duplicate value.

"input.txt".slurp.uniq.map:{ "$_\n" }.say

and this will work once slurp is fixed:

"input.txt".slurp.uniq.say

will print out the uniq rows in the input.txt file to the screen


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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


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