Private variables for a PowerShell script

Powershell-Private-Variables

# Source the script
PS> . .\Private-Variable.ps1

# Set foo variable
PS> Set-Foo (New-Object System.Object)

# Get the value
PS> Get-Foo

Name                           Value
----                           -----
Foo                            System.Object

# Try to access the value directly
PS> Get-Variable -Name "Foo"
Get-Variable : Cannot access the variable '$Foo' because it is a private variable

# Source the script again
PS> . .\Private-Variable.ps1

# Get the value again
PS> Get-Foo

Name                           Value
----                           -----
Foo                            System.Object

Private-Variable.ps1

function Get-Foo
{
	Get-Variable -Name "Foo" -Scope "global" -ErrorAction Ignore
}

function Set-Foo
{
	if (Get-Variable -Name "Foo" -Scope "global" -ErrorAction Ignore) {
		throw "Foo is already defined!"
	}
	else {
		Set-Variable -Name "Foo" -Value $args[0] -Scope "global" -Visibility Private
	}
}