Finding out current index in EACH loop (Ruby)

Question

Possible Duplicate:
Automatic counter in Ruby for each?

I want to find out the current index while i am in the each loop. how do i do so?

X=[1,2,3]

X.each do |p|
 puts "current index..."
end

Duplicate of http://stackoverflow.com/questions/533837/automatic-counter-in-ruby-for-each — Andrew Grimm, May 17 '10 at 23:12

score 330 · Accepted Answer · edited Aug 19 '16 at 21:31

330

X.each_with_index do |item, index|
  puts "current_index: #{index}"
end

edited Aug 19 '16 at 21:31

Joe Kennedy

answered May 17 '10 at 02:18

Chubas

3

This solution is clearer and more concise than what's in the duplicate. – Sisi Jan 16 '13 at 21:09
2

You can actually do this in the for loop, `for each,index in X.each_with_index; ...; end` – akuhn Aug 12 '13 at 07:25
2

Why does ruby's author bother to introduce each_with_index... – Frank Fang Dec 28 '16 at 09:45

score 18 · Answer 2 · answered May 17 '10 at 02:18

18

x.each_with_index { |v, i| puts "current index...#{i}" }

answered May 17 '10 at 02:18

horseyguy

3

`i` should be the second parameter to the block – Chubas May 17 '10 at 02:20
2

Chubas, yeah that always gets me, thanks – horseyguy May 17 '10 at 02:20
how to get index value without each_with_index method? – Kamal Panhwar Dec 01 '19 at 07:50

2 Answers2