FAQ: Loops & Iterators - The 'Until' Loop

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

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FAQs on the exercise The ‘Until’ Loop

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[devace43588]

In this exersise counter is beeing set to 1. I have to fill in a loop that stops at 11. Thats al ok. But the thing i dont understand ist that we "puts"counter on line 4. And after line 4 we set counter to counter= counter+1.

How is it possible that this get printed in the console while at the time the puts command was not given?

[rrreddd]

Line 4’s “puts counter” executes the variable already defined in Line 1 “counter = 1”.

The subsequent “counter = counter + 1” is applied to returns thereafter, incrementing each subsequent interation of “counter” by the value of “1”.

“counter = counter + 1” can also (instead) be written as “counter += 1” for the same result.

[rutterbrian]

It did it again.

[mtf]

Try,

puts counter.round(1)

[herebeandre]

Hi @rrreddd

I tried to run your code by following the instructions of the exercise:

On line 2, fill in the __ blank so that the loop breaks when counter is greater than 10.

So, the following code:

counter = 1
until counter > 10
  puts counter += 1
end

is displayed by the console like so:

2
3
4
5
6
7
8
9
10
11

Data number 11 is also included , despite the fact we want to exclude it.
Therefore, in this case, I think that when using counter = counter += 1 we should also change the comparison operator to >= or ==, like so:

counter = 1
until counter >= 10
  puts counter += 1
end

Which returns:

2
3
4
5
6
7
8
9
10

Can someone confirm this?

[xxsempiternalxx]

Your code does work, however, by using

puts counter += 1

You don’t include the counters original value of 1. Your puts statement should instead be on the line above:

counter = 1
until counter > 10
  puts counter
  counter += 1
end

This way you can use > instead of >= and still get the 1-10.

[mtf]

By the same token, what if counter = 0, initially?

puts expression

The evaluation of expression takes place first, and since += is an in-place operation it increments counter.

counter = 0 
until counter > 10
    puts counter += 1
end

1
2
3
4
5
6
7
8
9
10

[beta7715079261]

counter = 1

until counter > 10

puts counter

Add code to update ‘counter’ here!

counter = counter + 1

end

[jfootball81]

I’m confused why this stops at 10 even though its written to evaluate that the counter is to stop unless its greater than ten. It prints out 2-10 (since it started at one) but why doesn’t it stop at 11. Any thoughts on this? Just want to make sure I fully understand the basics.