My take on a ternary operation for PowerShell, I use it for my stuff and make no promises. Enjoy!

Ternary.ps1

<#
.Synopsis
   Ternary operation for PowerShell with terse
   parameter aliases. Meant to be used from pipeline.
.Example
   gci -Recurse | >> {$_.PSIsContainer} "Directory" "File"
.Example
   1..10 | >> {($_ % 2) -eq 0} "Even" "Odd"
.Example
   # Pass through numbers greater than 0 or print 0
   $random_number_list | >> {$_ -gt 0} {$_} 0
.Example
   # Nested expressions must qualify the predicate input variable
   gci | >> {$_.PSIsContainer} "Directory" {>> {param($i) $i -lt 8192} "SmallFile" "BigFile" ($_.Length)}
#>
function Ternary
{
    [CmdletBinding()]
    [Alias(">>")]
    Param
    (   
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$false,
                   Position=0)]
        [Alias("P")]
        [ScriptBlock]$Predicate,
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$false,
                   Position=1)]
        [Alias("T")]
        $Expr1,
        [Parameter(Mandatory=$true,
                   ValueFromPipeline=$false,
                   Position=2)]
        [Alias("F")]
        $Expr2,
        # Param1 help description
        [Parameter(Mandatory=$false,
                   ValueFromPipeline=$true,
                   Position=3)]
        $InputObj
    )
    Process
    {
        if ([bool]($Predicate.Invoke($InputObj))) {
            if ($Expr1.GetType().Name -like 'ScriptBlock') { $Expr1.Invoke($InputObj) }
            else { $Expr1 }
        }
        else {
            if ($Expr2.GetType().Name -like 'ScriptBlock') { 
                $Expr2.Invoke($InputObj) 
            }
            else { $Expr2 }
        }
    }
}