GetPsBoundParameters.ps1

function Get-psBoundParameters {
    [CmdletBinding()]
    param
    (
        [bool]
        $FooBar,
             
        [Parameter(Mandatory = $false)]
        [bool]
        $WhatIs,

        [Parameter(Mandatory = $false)]
        [Switch]
        $MyLittle
    )

    if ($PSBoundParameters.ContainsKey('WhatIs') -eq $false) {
        $WhatIs = $false
    }

	if($PSBoundParameters.ContainsKey('MyLittle') -eq $false)  {
        $MyLittle = $true
    }

     Write-Host  "Value of `$WhatIs = $WhatIs, NullOrEmpty $([string]::IsNullOrEmpty($WhatIs)), $($PSBoundParameters.ContainsKey('WhatIs'))"
     Write-Host  "Value of `$MyLittle = $MyLittle, NullOrEmpty $([string]::IsNullOrEmpty($MyLittle)), $($PSBoundParameters.ContainsKey('MyLittle'))"

}


Clear-Host 

Get-psBoundParameters -FooBar $true -WhatIs $true