Maybe monad in powershell

maybe-monad.ps1

function mbind
{
    param(
        [parameter(valuefrompipeline=$true)]$Ma, 
        [parameter(position=0)][scriptblock]$fMb
        )

    process 
    {
        if ($Ma) {
            & $fMb $Ma
        } else {
            $null
        }
    }
}

function safe-div($a, $b)
{
    write-host "$a / $b"
    if ($b -eq 0) {
        $null
    } else {
        $a / $b
    }
}

(safe-div 10 5) | mbind { param($v) safe-div 4 $v } | mbind { param($v) safe-div $v 0 } | mbind { param($v) safe-div $v 2 }