Use a Ruby method like a block or lambda
Sometimes you want to use a vanilla Ruby method like a block. You can use
foo_plus = "foo".method(:+) foo_plus.call("bar") # => "foobar"
The method reference also understands
#to_proc so you can feed it to block-taking methods by prefixing it with
printer = method(:puts) [1, 2, 3].each(&printer) # will print one line per number
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