antigravity-skills-reference/skills/avalonia-zafiro-development/zafiro-shortcuts.md

Zafiro Reactive Shortcuts

Use these Zafiro extension methods to replace standard, more verbose Reactive and DynamicData patterns.

General Observable Helpers

Standard Pattern	Zafiro Shortcut
Replay(1).RefCount()	ReplayLastActive()
Select(_ => Unit.Default)	ToSignal()
Select(b => !b)	Not()
Where(b => b).ToSignal()	Trues()
Where(b => !b).ToSignal()	Falses()
Select(x => x is null)	Null()
Select(x => x is not null)	NotNull()
Select(string.IsNullOrWhiteSpace)	NullOrWhitespace()
Select(s => !string.IsNullOrWhiteSpace(s))	NotNullOrEmpty()

Result & Maybe Extensions

Standard Pattern	Zafiro Shortcut
Where(r => r.IsSuccess).Select(r => r.Value)	Successes()
Where(r => r.IsFailure).Select(r => r.Error)	Failures()
Where(m => m.HasValue).Select(m => m.Value)	Values()
Where(m => !m.HasValue).ToSignal()	Empties()

Lifecycle Management

Description	Method
Dispose previous item before emitting new one	DisposePrevious()
Manage lifecycle within a disposable	DisposeWith(disposables)

Command & Interaction

Description	Method
Add metadata/text to a ReactiveCommand	Enhance(text, name)
Automatically show errors in UI	HandleErrorsWith(notificationService)

Tip

Always check Zafiro.Reactive.ObservableMixin and Zafiro.CSharpFunctionalExtensions.ObservableExtensions before writing custom Rx logic.