@GitHub Copilot - Welcome @BanterBoy, I’m your Copilot and I’m here to help you get things done faster. I can identify issues, explain and even improve code.

You can ask generic questions, but what I’m really good at is helping you with your code. For example:

Generate unit tests for my code Explain the selected code Propose a fix for the bugs in my code If you want to learn more about my capabilities and limitations, check out the Copilot documentation.

I’m powered by AI, so surprises and mistakes are possible. Make sure to verify any generated code or suggestions, and share feedback so that we can learn and improve.

@BanterBoy: - Explain what the script does and why it is useful.

@GitHub Copilot - This PowerShell script defines a class called Greetings that contains a mapping of ASCII art greetings for each day of the week. The Process method of the class takes a string parameter name and writes the corresponding ASCII art greeting to the console. The GreetingsValidator class implements the IValidateSetValuesGenerator interface to provide a list of valid values for the Day parameter of the New-Greeting function. The New-Greeting function is a PowerShell cmdlet that takes an optional Day parameter and returns a greeting message for the specified day of the week. If no day is specified, it defaults to the current day of the week.

The New-Greeting function uses the Greetings class to retrieve the greeting message for the specified day of the week. The ValidateSet attribute on the Day parameter ensures that only valid day names are accepted as input. The Begin block of the function initializes the Greetings object and sets the Day parameter to the current day of the week if it is not specified.

To improve the readability of the code, the Process method of the Greetings class could be renamed to something more descriptive, such as WriteGreetingToConsole. Additionally, the GetMessageForDay method of the Greetings class could be refactored to use a switch statement instead of a series of if-else statements for better performance. Finally, the New-Greeting function could benefit from more descriptive parameter names, such as DayOfWeek instead of Day.

@BanterBoy: - Explain how to use the script and provide examples.

@GitHub Copilot - Certainly! Here are some examples of how to use the New-Greeting function:

To get the greeting for the current day of the week:


To get the greeting for a specific day of the week:

New-Greeting -Day Monday

To get a list of valid day names:


Note that the New-Greeting function will only accept valid day names as input, so make sure to use one of the values returned by the above command.


class Greetings {
    $greetings = @{
        Monday   = "Don't want to work today"
        Friday   = "Almost the weekend"
        Saturday = "Everyone loves a Saturday ;-)"
        Sunday   = "A good day to rest, or so I hear."

    [string[]] $Days = @( "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" )

    $Date = $(Get-Date)

    [string] $CurrentDay = $this.Date.DayOfWeek

    [object] GetMessageForDay([string] $day) {
        $time = $this.Date.ToShortTimeString()

        $message = $this.greetings[$day]

        if ([String]::IsNullOrWhiteSpace($message)) {
            $message = "Business as usual."

        $properties = [ordered]@{
            "Date"    = $this.Date.ToShortDateString()
            "Day"     = $day
            "Time"    = $time
            "Message" = $message

        return New-Object -TypeName PSObject -Property $properties

    Process([String] $name) {
        Write-Host($this.asciiMappings[$name] | Set-Clipboard -PassThru)

class GreetingsValidator : System.Management.Automation.IValidateSetValuesGenerator {
    [String[]] GetValidValues() {
        return [Greetings]::new().Days

function New-Greeting {
    [CmdletBinding(DefaultParameterSetName = 'Default')]
        [Parameter(ParameterSetName = 'Default',
            Mandatory = $false,
            ValueFromPipeline = $true,
            ValueFromPipelineByPropertyName = $true,
            HelpMessage = 'Enter '

    Begin {
        $greetings = [Greetings]::new()

        if ([String]::IsNullOrWhiteSpace($Day)) {
            $Day = $greetings.CurrentDay

    Process {
        Write-Output $($greetings.GetMessageForDay($Day))

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