[Ruby] Yield but no block argument

Such a function


module Enumerable
  def all?(*several_variants)
    yield to_enum.next; __unknown

use all? like this


%w[ant bear cat].all? { |word| word.length >= 3 } #=> true

Why can I pass it even though there is no & block in the argument? That's because the block argument can be omitted if there is a yield in the ** method **.

However, if you do not look inside the method, you will not know if you can pass the block, so it seems that you need to consider whether to omit it.

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