Use more simple check for existence of member

windows/ping.ps1

@@ -7,7 +7,7 @@ If ($args.Length -gt 0)
 }
 
 $data = 'pong';
-If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'data')
+If ($params.data.GetType)
 {
    $data = $params.data;
 }

windows/slurp.ps1

@@ -8,13 +8,13 @@ If ($args.Length -gt 0)
 }
 
 $src = '';
-If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'src')
+If ($params.src.GetType)
 {
    $src = $params.src;
 }
 Else
 {
-   If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'path')
+   If ($params.path.GetType)
    {
       $src = $params.path;
    }

windows/stat.ps1

@@ -8,13 +8,13 @@ If ($args.Length -gt 0)
 }
 
 $path = '';
-If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'path')
+If ($params.path.GetType)
 {
    $path = $params.path;
 }
 
 $get_md5 = $TRUE;
-If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'get_md5')
+If ($params.get_md5.GetType)
 {
    $get_md5 = $params.get_md5;
 }

windows/win_ping

@@ -7,7 +7,7 @@ If ($args.Length -gt 0)
 }
 
 $data = 'pong';
-If (($params | Get-Member | Select-Object -ExpandProperty Name) -contains 'data')
+If ($params.data.GetType)
 {
    $data = $params.data;
 }