# FAQ: Loops & Iterators - Try It Out!

This community-built FAQ covers the “Try It Out!” exercise from the lesson “Loops & Iterators”.

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I am not sure if this will work for posting a question but here we go.
With this iterator layout or format:
odds = [1,3,5,7,9]
odds.each {|x| print x * 2}

How do I make sure a comma is added after each result?
Thank you.

1 Like

You could use string interpolation…

`````` print "#{x.to_s},"
``````

but then it would put a comma on the last value.

Another approach would be to use the `map` iterator which returns an array. Then use the `join` method to output a string.

``puts odds.map( |x| (x * 2).to_s ).join(', ')``