Re: Making a count of unique elements in an array

Newsgroups	comp.lang.ruby
Date	2013-12-26 13:44 -0800
References	<1136789236.482098.144200@o13g2000cwo.googlegroups.com> <5327790f-e3da-4cb6-a94c-b198de7139da@googlegroups.com> <bh3etcFg4fbU1@mid.individual.net>
Message-ID	<9d904cf9-f46c-4ec9-8564-45614ff97501@googlegroups.com> (permalink)
Subject	Re: Making a count of unique elements in an array
From	lukeabergen@gmail.com

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Another way is the super-useful group_by and map

arr = ["a", "b", "b", "c", "c", "d", "e", "e", "e"]
grouped = arr.group_by {|x| x}  #=> produces something like {"a" => ["a"], "b" => ["b", "b"], etc...
result = grouped.map {|el, arr| [el, arr.count]}

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Re: Making a count of unique elements in an array vsingla160@gmail.com - 2013-12-12 09:56 -0800
  Re: Making a count of unique elements in an array Norbert Melzer <norbert.melzer@gmx.net> - 2013-12-12 19:44 +0100
  Re: Making a count of unique elements in an array Robert Klemme <shortcutter@googlemail.com> - 2013-12-14 17:22 +0100
    Re: Making a count of unique elements in an array lukeabergen@gmail.com - 2013-12-26 13:44 -0800
      Re: Making a count of unique elements in an array Robert Klemme <shortcutter@googlemail.com> - 2013-12-28 12:02 +0100

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