powershell wow so pure very functional

such expected.ps1

$ cat function.ps1
function f() {
    { param($x) "expected output" }.Invoke()
}

function g() {
    { param($x) "unexpected" }.Invoke()
    return "output"
}

Write-Host (f).GetType()
Write-Host (g).GetType()

$ powershell ./function.ps1
System.String
System.Object[]

unexpected.ps1

$ cat function.ps1
function func() {
    { param($x) "un" }.Invoke()
    $res = "expected"
    Write-Host $res
    return $res
}

Write-Host(func)

$ powershell ./function.ps1
expected
un expected