Why does Enumerator.new require a yielder object?

Question

Consider a simple Enumerator as follows:

natural_numbers = Enumerator.new do |yielder|
  number = 1
  loop do
    yielder.yield number
    number += 1
  end
end

My question is: why does a ruby ​​need us to generate income on a yielder? Another way: why can't we replace yielder.yield numberwith yield number? In this example, it would be similar to the same if it were allowed. Are there examples where yielder is used in a non-trivial way? If so, can you give one? If not, what is the purpose of yielder?

Thank.

Answer 1

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