I keep fighting outputs given an `Output lt ImmutableArray l

Question

I keep fighting outputs given an `Output lt ImmutableArray lt string gt gt ` of aws subnet ids fwiw I need to create a bunch of aws resources for each subnet Unless I m missing something there doesn t seem to be a nice way to enumerate the array outside of apply since there s no way to get the array length unless I use `OutputUtilities`

worried-city-86458 · Answer

```var subnetCount = OutputUtilities GetValueAsync privateSubnetIds Apply ids = gt ids Length GetAwaiter GetResult for var i = 0 i lt subnetCount ++i new MountTarget $ awsEksPrefix efs mount target i + 1 new MountTargetArgs FileSystemId = efsfileSystem Id SecurityGroups = efsSecurityGroup Id SubnetId = privateSubnetIds GetAt i new CustomResourceOptions Provider = awsProvider ```

tall-librarian-49374 · Answer

Indeed there s no blessed way to iterate on an output of array outside `apply` The snippet above may work but I m curious why you think it s better than a loop inside apply

bumpy-grass-54508 · Answer

i ve had this same problem and similar solution or sometimes just having to know the total count ahead of time the reason is because you aren t supposed to create pulumi resources inside of an Apply at least that is what I was mostly sure of

worried-city-86458 · Answer

Which is the lesser evil The above or creating resources inside apply Is the latter to be avoided at all cost or just a guideline

tall-librarian-49374 · Answer

Just a guideline I expect them to behave similarly

worried-city-86458 · Answer

Okay but preview won t work for resources created in apply right

tall-librarian-49374 · Answer

It will not show those resources initially yes I suppose it won t work for your example either