7. Kapan Menggunakan Setiap Pendekatan

Decision Tree

swift
Apa yang ingin kamu guard?
│
├── Syntax / fitur language (typed throws, ~Copyable)
│   └── Gunakan: #if swift(>=6.0) atau #if hasFeature(FeatureName)
│
├── Module baru (Synchronization, Observation)
│   └── Gunakan: #if canImport(ModuleName)
│
├── Versi toolchain/compiler (Xcode version)
│   └── Gunakan: #if compiler(>=6.0)
│
├── API yang tersedia di OS versi tertentu
│   └── Gunakan: @available(iOS X, *) atau #available(iOS X, *)
│
└── Ingin aktifkan fitur Swift 6 satu per satu (tanpa full migration)
    └── Gunakan: enableUpcomingFeature di Package.swift / Build Settings

Tabel Perbandingan

Directive	Berdasarkan	Compile-time?	Contoh penggunaan
`#if swift(>=6.0)`	Language version (SWIFT_VERSION)	Ya	Typed throws, Sendable
`#if compiler(>=6.0)`	Toolchain version (Xcode)	Ya	API compiler baru
`#if canImport(X)`	Ketersediaan module	Ya	Synchronization, Observation
`#if hasFeature(X)`	Fitur language spesifik	Ya	NoncopyableGenerics
`@available(iOS X)`	OS version	Runtime	API OS baru
`#available(iOS X)`	OS version	Runtime	Branching runtime
`enableUpcomingFeature`	Opt-in per fitur	Build setting	Migrasi bertahap