An Implementation of the Reduce Function for PowerShell

Reduce-Object.ps1

function Reduce-Object
{
  [CmdletBinding()]
  Param
  (
    [Parameter(Mandatory = $true)]
    $InitialValue,

    [Parameter(ValueFromPipeline = $true)]
    $InputObject,

    [Parameter()]
    $ScriptBlock
  )

  Begin { $result = $InitialValue }

  Process
  {
    $commandContext =
    @{
      'ScriptBlock'  = $ScriptBlock
      'ArgumentList' = $InputObject,$result
    }
    $result = Invoke-Command @commandContext
  }

  End { $result }
}