5

As the title states, I'd like to know the proper way to check if an iterator is complete.

I couldn't find anything in the docs but I found something like this in the source: 

iter.next.is_a? Iterator::Stop

Toy example:

a = "a世c"
b = a.each_char

puts b.next # a
puts b.next # 世
puts b.next # c
puts b.next # #<Iterator::Stop:0x8ccbff8>

if b.next.is_a? Iterator::Stop
  puts "DONE" # successfully prints DONE
end

Is this correct and proper or is there a different way I should use.

Lye Fish
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1 Answers1

3

Yes, that's the proper way. But most of the time you don't need to deal with next, you just chain iterators and get a result out of them.

asterite
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    Thanks. Right now I'm just porting some code and so I'm doing direct conversion as much as possible and will likely refactor later. – Lye Fish Oct 01 '15 at 23:51