Ruby hópur af eiginleiki
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ruby fylki hópur af eiginleiki
irb(main):001:0> aers = %w(a b c d ab bc de abc)
#=> ["a", "b", "c", "d", "ab", "bc", "de", "abc"]
irb(main):002:0> aers.group_by{ |s| s.size }
#=> {1=>["a", "b", "c", "d"], 2=>["ab", "bc", "de"], 3=>["abc"]}
people.group_by { |p| p['age'] }Tengjast Síður
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