Unique characters: Difference between revisions

=={{header|Ruby}}==

<syntaxhighlight lang="ruby">words = ["133252abcdeeffd", "a6789798st", "yxcdfgxcyz"]

counter = words.inject({}){|h, word| word.chars.tally(h)}

puts counter.filter_map{|char, count| char if count == 1}.sort.join

</syntaxhighlight>

{{out}}

<pre>

156bgstz

</pre>