FAQ: Loops & Iterators - The 'For' Loop

This community-built FAQ covers the “The ‘For’ Loop” exercise from the lesson “Loops & Iterators”.

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This exercise can be found in the following Codecademy content:

Learn Ruby

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So I ran this program and to me it should print the numbers 1 thru 10, but it prints 1 thru 9 - why?
The code is:

for num in 1…10
puts num

To me it looks like it counts, prints then ends through the number 10 not until the number 10.

Well, I should have clicked next, the next lesson direction tell me that the … say stop before last value. Seems like an odd rule, and they say English is the hardest language to learn. lol.


Ruby is supposed to be easy to read and understand. I don’t know how “for num in 1…10” is easier than basic For i= 1 to 10. Just my opinion here.

Hey @fenderman9

I don’t know… for num in 1...10 seems to have better readability. For example, if someone looked over the ruby code, they’d be able to immediately see what that was going to do, or at least guess at it, whereas:

is probably a little bit more confusing.

hi ! I have a question about “for num in 1 … 10”
why does the result include 1 but not 10 ?

woops nevermind, the exercice just explains why in the next step