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Showing content from https://docs.ruby-lang.org/en/master/StopIteration.html below:

class StopIteration - Documentation for Ruby 3.5

Raised to stop the iteration, in particular by Enumerator#next. It is rescued by Kernel#loop.

loop do
  puts "Hello"
  raise StopIteration
  puts "World"
end
puts "Done!"

produces:

Hello
Done!

static VALUE
stop_result(VALUE self)
{
    return rb_attr_get(self, id_result);
}

Returns the return value of the iterator.

o = Object.new
def o.each
  yield 1
  yield 2
  yield 3
  100
end

e = o.to_enum

puts e.next                   
puts e.next                   
puts e.next                   

begin
  e.next
rescue StopIteration => ex
  puts ex.result              
end

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