Way to break out of an inner For loop in Swift

Question

Is there a simple way to break out of an inner For loop, i.e. a Fro loop within another For loop? Without having to set additional flags for example

additional flag is the simplest way in many languages. Sometimes there is a different solution but we would have to see the loop. — Sulthan, Jan 24 '16 at 19:39
Also http://stackoverflow.com/questions/30768931/new-control-transfer-statements-labels-for-swift-2-0 — dawg, Jan 24 '16 at 19:54

score 34 · Answer 1 · answered Jan 24 '16 at 19:40

34

You just need to name your loop. Like this:

   let array = [1,2,3]

   for number in 1...6 {

        innerLoop: for i in array {

            let newNumber = i + number

            if i == 2 {

                break innerLoop
            }
        }
    }

answered Jan 24 '16 at 19:40

Max Phillips

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Great answer! I had a loop(3) inside a loop(2) inside a dictionary loop(1) and once I found the value in (3) I was able to easily stop the dictionary loop (1). Thanks – Lance Samaria May 09 '19 at 19:44

score 22 · Accepted Answer · answered Jan 24 '16 at 19:45

22

There are three basic methods:

Using an additional boolean flag
Using a labelled loop (label: for ...) and then break label
Extracting the loops into a separate function/method and then using a return instead of a break.

From code quality perspective I believe 3. is the best solution.

answered Jan 24 '16 at 19:45

Sulthan

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Thanks, used the labelled outerLoop approach – DavidS Jan 24 '16 at 19:55

Way to break out of an inner For loop in Swift

2 Answers2