For single methods without argument, you can use shorthand syntax (aka. "passing a proc"):
[1, 2, 3, 4].count(&:even?) # => 2
You can also define your own methods and do something similar using &method.
&method
def dog?(animal) ["spaniel", "schnauzer"].include? animal end
["perch", "spaniel", "haddock", "schnauzer", "cod"].count(&method(:dog?)) #=> 2
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For single methods without argument, you can use shorthand syntax (aka. "passing a proc"):
You can also define your own methods and do something similar using
&method.