[rikkus]

Powershell is a nice language.

Here's map/filter/reduce. Golf welcome.

  @(1, 2, 3) `
     | % { $_ + 1 } `
     | ? { $_ -gt 2 } `
     | Measure-Object -Sum
     | Select Sum

You can write a generic reduce like this:

  $reduce = {
    param   ([scriptblock]$reducer)
    begin   { $initialised = $false }
    process { 
      if (-not $initialised) {
        $agg = $_
        $initialised = $true
      } else {
        $agg = &$reducer $agg $_
      }
    }
    end     { $agg }
  }

And then use it like this:

  @(1, 2, 3) | &$reduce { param($agg, $i) $agg + $i }