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Feature #5389
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New method Enumerator#iterate
Description
If we want to iterate over the elements of a enumerable object with multiple blocks, we can use the Enumerator class.
A method 'iterate' is required, we can write it in Ruby:
class Enumerator
def iterate
yield_value = self.next
return_value = yield yield_value
self.feed return_value
self
end
end
Well, here is an example:
array = (1..10).to_a
enum = array.map!
loop do
enum.iterate {|n| n + 10 }
enum.iterate {|n| n * 2 }
enum.iterate {|n| -n }
end
p array # => [11, 4, -3, 14, 10, -6, 17, 16, -9, 20]
We want to map an array: the 1st element use blk1, the 2nd use blk2, the 3rd use blk3...
I think this Enumerator#iterate method is sometimes useful, so would you please introduce it into the language core?
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