Ruby: Some examples of yielding to create a custom each method

my_each

def my_each (array)
  i = 0
  while i < array.length
    yield array[i]
    i += 1
  end
end

my_each [1, 2, 3, 4, 5] { |i| puts i**2 }

class Array
  def my_each
    i = 0
    while i < self.length
      yield self[i]
      i += 1
    end
  end
end

[1, 2, 3, 4, 5].my_each { |i| puts i**2 }