Using contains operator for array of objects in powershell

Question

I have a powershell object array like this

$EdosContainers= @([pscustomobject]@{Container='FoundationObjectStoreConfigMetadata';PartitionKey='/templateName'}
       [pscustomobject]@{Container='FoundationObjectStoreObjectInformation';PartitionKey='/processExecutionId'}
       [pscustomobject]@{Container='FoundationObjectStoreObjectMetadata';PartitionKey='/processExecutionId'}
       [pscustomobject]@{Container='FoundationObjectStoreConfigMetadataTransfomed';PartitionKey='/templateName'})

But I need to check whether a given value exists in the array or not in the container attribute.

I know we can use -contains method for checking the existence of an item in array. But since mine is an object array how can we accomplish this?

So, you want to be able to do something like `$EdosContainers -contains ([pscustomobject]@{Container='SomeContainerName';PartitionKey='/partition/key'})`? — Mathias R. Jessen, Aug 10 '22 at 13:42

mklement0 · Accepted Answer · 2022-08-10T14:32:44.303

You can take advantage of member-access enumeration, which extracts all .Container property values from the array's elements by directly applying the property access to the array, allowing you to use -contains:

# -> $true
$EdosContainers.Container -contains 'FoundationObjectStoreConfigMetadataTransfomed'

If you want to avoid the implicit creation of an array with all .Container values, use the intrinsic .Where() method:

[bool] $EdosContainers.Where(
  { $_.Container -eq 'FoundationObjectStoreConfigMetadataTransfomed' }, 
  'First'  # Stop, once a match is found.
)

While this is more memory-efficient than using member-access enumeration, it also noticeably slower with large arrays.

My pleasure, @SandeepThomas. I later saw that Omkar76 suggested that your question is a duplicate, which I think is correct, so I'm closing it as such. — mklement0, Aug 10 '22 at 15:36

Using contains operator for array of objects in powershell

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