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Discussion on: Level Up Your Ruby Skillz: Working With Arrays

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Replies for: For single methods without argument, you can use shorthand syntax (aka. "passing a proc"): [1, 2, 3, 4].count(&:even?) # => 2

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Oliver •

You can also define your own methods and do something similar using &method.

def dog?(animal)
  ["spaniel", "schnauzer"].include? animal
end  

["perch", "spaniel", "haddock", "schnauzer", "cod"].count(&method(:dog?))
#=> 2