Example of how to batch process an array using a PowerShell pipeline.

Batch-Pipe.ps1

# Implementation
function Batch-Pipe {
    [CmdletBinding()]
    [OutputType('System.String')]
    param(
        [Parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [ValidateNotNull()]
        $InputArray
    )

    begin {
        # Intialize the batch variable.
        New-Variable -Name '_batch' -Scope 'Local'
    }
    process {
        # Process acts as a ForEach Loop so we need to batch it.
        $local:_batch += $InputArray
    }
    end {
        # Now $InputArray is batched we can process the array.
        return $local:_batch
    }
}

# Usage, returns 'One Two'
@(
    'One',
    'Two'
) | Batch-Pipe