Pwsh Function with Pipeline and Parameter Input.ps1

function Test-Function {
    [CmdletBinding()]
    param(
        [parameter(Mandatory, Position = 0, ValueFromPipeline)]
        [string[]]
        $Values
    )
    
    process {
        $Values.ForEach({
            $newValue = foreach ($c in [char[]]$_) {
                $rand = Get-Random -Minimum 0x300 -Maximum 0x36F
                "$c$([char]$rand)"
            }
            [string]$newValue
        }) 
    }
}

Test-Function "Hello there!", "Hello world!"

"Hello there!", "Hello world!" | Test-Function