How to exist from each loop

[v-upsi]

Hi,

Is there way to exist from apply to each loop?

Thanks,

Upendra Singh

[Pstork1]

'There is no way to exit early from a foreach Loop. You'll need to redesign the loop to use a do until loop to loop through each item using an index. Using a variable you can then control when to exit the do until loop.

[efialttes]

Hi!

There is a partial workaround, that is to force a crash by means of a wrong WDL expression, something like:

split('qwerty','a')[2]

The point is, current iteration will fail, but the loop will start next. That's why I call it 'partial'. The point is, overall 'Apply to each' execution will be marked as 'Failed'. 

If this approach is anyway fine for you, then you need to be careful when designing next steps after 'Apply to each', so you need to implement a branch whose 'Run after' settings shall take care of the error and apply the expected logic

Hope this helps

[Pstork1]

That will break you out of the current iteration, but won't break you out of the actual loop will it?  It will run the next item in line.  I think the questioner wants to actually break out of the Loop.

[v-alzhan-msft]

Hi @v-upsi ,

Could you please explain more details about the your issue so we could better understand you and provide the solution?

Do you want to check if an item exists within an "Apply to each"? If yes, you could take a try to refer to screenshot below to create the flow:

Best Regards,

Alice

Community Support Team _ Alice Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[v-upsi]

Hi @v-alzhan-msft 

I have apply to each condition where i have added some condition to validate so what i want is while iterating the loop if condition meet at first iteration so my apply to each condition should exist from first iteration and it should not iterated remaining items from loop. And after apply to each there is other step which depend on condition value which should execute.

[v-upsi]

Hi @Pstork1 

Thanks for your suggestion on this. I just want to know if add some logic inside the apply to each condition to fail the steps so what will happen if i have other step next to apply to each, it will also fail to run which i don't want.

I have other step which use this apply to each condition value and perform some other action.

Thanks,

Upendra Singh

[v-alzhan-msft]

Hi @v-upsi ,

If you just want to check the first item in the array, you could create the flow as below:

body('Get_items')?['value']?['0']

outputs('Compose_3')?['Title']

Best Regards,

Alice

Community Support Team _ Alice Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[v-upsi]

Hi @v-alzhan-msft 

I just explain as example because if it's apply to each so I don't know when this condition will match, it might match at first iteration, second and so on. So when that condition match then it will exist from each loop.

Thanks

Upendra Singh

[Pstork1]

In an apply to each loop failing an individual iteration will make the loop go on to the next iteration of the loop.  As I said if you want to be able to break out of a loop you'll need to use a do until loop set to exit after either setting a control variable to a certain value or iterating through the last item.

[efialttes]

@Pstork1 

You are right, current iteration will fail, but the loop will start next iteration. That's why I call the suggested workaround as 'partial'. 

Hope this helps

[efialttes]

@v-upsi 

Does your 'Apply to each' contain only the Condition action block? If so, you can probably replace both 'Apply to each' and 'Condition', add 'Filter array' action block instead

Hope this helps

[v-upsi]

Hi @efialttes 

It have multiple condition check inside my apply to each.

Thanks,

Upendra Singh

[v-alzhan-msft · Accepted solution]

Hi @v-upsi ,

If you don't know the place the item you needed, I'm afraid that your requirement couldn't be achieved in Microsoft flow currently.

Best Regards,

Alice

Community Support Team _ Alice Zhang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[Pstork1]

Here's how to change your loop to use a Do Until Loop, which you can break out of.

1) Initialize two variables, one to hold the number of items returned by the Get Items and the other as a Boolean set to False.

2) Use a DoUntil Loop to iterate through the items returned by Get Items. When you want to break out of the Loop set the Boolean variable to True.  The loop will terminate on the next iteration.

3) Access the values of the items inside the loop using iterationIndex as an index on the collection.  For example this JSON returns the Title property of one the current Get Items list item.

body('Get_items')?['value'][iterationIndexes('Do_until')]?['Title']