[SOLVED] Using contains operator for array of objects in powershell

Using contains operator for array of objects in powershell

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?

Solution

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.