Chapter4/4.9_Class/DesignPattern/Singleton.ps1
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using namespace System.Linq using namespace System.Threading.Tasks class Singleton { static [Singleton] $Instance [Guid]$Guid = [Guid]::NewGuid() hidden Singleton(){ } static [Singleton] GetInstance() { if ([Singleton]::Instance -eq $null) { [Singleton]::Instance = [Singleton]::new() } return [Singleton]::Instance } } $range = [Enumerable]::Range(0,1000) [Enumerable]::Select($range, [Func[int, Guid]]{ param([int]$x) [Singleton]::GetInstance().Guid }) |