Creating objects with methods in PowerShell - Part 1

gistfile1.ps1

# Code from my blog entry at http://betterlivingthroughcode.blogspot.com/2014/02/creating-real-objects-in-powershell.html

$myObject = New-Object -TypeName PSObject
$myObject | Add-Member -MemberType NoteProperty -Name Name -Value "Kevin"

$myObject.Name

# Let's add a simple method
$myObject | Add-Member -MemberType ScriptMethod -Name SayHello -Value {"Hello $($this.Name)"}
$myObject.SayHello()

# Let's add a method with a parameter
$myObject | Add-Member -MemberType ScriptMethod -Name Say -Value {param($Message) "$Message $($this.Name)"}
$myObject.Say("What's up")

# That's missing a question mark at the end. Let's add an optional second parameter
$myObject | Add-Member -MemberType ScriptMethod -Name Say2 -Value {param($Message, $End) "$Message $($this.Name)$End"}
$myObject.Say2("What's up", "?")


# Let's put some constraints on what $Message can be
$myObject | Add-Member -MemberType ScriptMethod -Name Say3 -Value {param([ValidateSet("Hello", "Goodbye")]$Message, $End="") "$Message $($this.Name)$End"}
 
# Note we don't have to specify the second parameter, since we gave it a default value.
$myObject.Say3("Hello")

# Now let's try with an invalid value for $Message
$myObject.Say3("What's up", "?")

# Let's create a script block
$nameGame = { 
    $nameEnd = $this.Name.Substring(1)
    "$($this.Name) $($this.Name) bo b$nameEnd"
    "banana fana fo f$nameEnd"
    "fee fi mo m$nameEnd"
    "$($this.Name)"
}

# Then add it to our object
$myObject | Add-Member -MemberType ScriptMethod -Name PlayNameGame -Value $nameGame

$myObject.PlayNameGame()