153

0150-derived-behavior-pt5/DerivedBehavior/DerivedBehavior/DerivedBehaviorApp.swift

@@ -5,9 +5,10 @@ struct DerivedBehaviorApp: App {
   var body: some Scene {
     WindowGroup {
       NavigationView {
-      AppView(
-        store: .init(initialState: AppState.init(counters: []), reducer: appReducer, environment: AppEnvironment(fact: .live, mainQueue: .main, uuid: UUID.init))
-      )
+//      AppView(
+//        store: .init(initialState: AppState.init(counters: []), reducer: appReducer, environment: AppEnvironment(fact: .live, mainQueue: .main, uuid: UUID.init))
+//      )
+        VanillaAppView(viewModel: AppViewModel(fact: .live, mainQueue: .main, uuid: UUID.init))
       }
     }
   }

0150-derived-behavior-pt5/DerivedBehavior/DerivedBehavior/VanillaView.swift

@@ -80,21 +80,29 @@ struct VanillaCounterView: View {
 class CounterRowViewModel: ObservableObject, Identifiable {
   @Published var counter: CounterViewModel
   let id: UUID
+  let onRemove: () -> Void
 
-  init(counter: CounterViewModel, id: UUID) {
+  init(
+    counter: CounterViewModel,
+    id: UUID,
+    onRemove: @escaping () -> Void
+  ) {
     self.counter = counter
     self.id = id
+    self.onRemove = onRemove
   }
 
   func removeButtonTapped() {
     // TODO: track analytics
+    DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
+      self.onRemove()
+    }
   }
 }
 
 struct VanillaCounterRowView: View {
   let viewModel: CounterRowViewModel
-  let onRemoveTapped: () -> Void
-
+
   var body: some View {
     HStack {
       VanillaCounterView(
@@ -105,7 +113,6 @@ struct VanillaCounterRowView: View {
 
       Button("Remove") {
         withAnimation {
-          self.onRemoveTapped()
           self.viewModel.removeButtonTapped()
         }
       }
@@ -197,6 +204,11 @@ struct VanillaFactPrompt: View {
   }
 }
 
+struct IdentifiedArray<Element: Identifiable> {
+  var ids: [Element.ID]
+  var lookup: [Element.ID: Element]
+}
+
 class AppViewModel: ObservableObject {
   @Published var counters: [CounterRowViewModel] = []
   @Published var factPrompt: FactPromptViewModel?
@@ -237,10 +249,28 @@ class AppViewModel: ObservableObject {
       }
     )
 
+    let id = self.uuid()
+//    let index = self.counters.endIndex
     self.counters.append(
       .init(
         counter: counterViewModel,
-        id: self.uuid()
+        id: id,
+        onRemove: { [weak self] in
+
+      // - quick lookup / in-place mutation
+      // - handles invariants for duplicate identities
+      // - simpler than ordered set (requires hashable elements)
+
+//          self?.counters.removeAll(where: { $0.id == id })
+      guard let self = self else { return }
+      for (index, counter) in zip(self.counters.indices, self.counters) {
+        if counter.id == id {
+          self.counters.remove(at: index)
+          return
+        }
+      }
+//      self?.counters.remove(at: index)
+        }
       )
     )
 
@@ -249,10 +279,6 @@ class AppViewModel: ObservableObject {
       .store(in: &self.cancellables)
   }
 
-  func removeButtonTapped(id: UUID) {
-    self.counters.removeAll(where: { $0.id == id })
-  }
-
   func dismissFactPrompt() {
     self.factPrompt = nil
   }
@@ -268,10 +294,7 @@ struct VanillaAppView: View {
 
         ForEach(self.viewModel.counters) { counterRow in
           VanillaCounterRowView(
-            viewModel: counterRow,
-            onRemoveTapped: {
-              self.viewModel.removeButtonTapped(id: counterRow.id)
-            }
+            viewModel: counterRow
           )
         }
       }

0151-tca-performance/DerivedBehavior/DerivedBehavior/DerivedBehaviorApp.swift

@@ -1,21 +1,17 @@
-//
-//  DerivedBehaviorApp.swift
-//  DerivedBehavior
-//
-//  Created by Point-Free on 5/12/21.
-//
-
+import ComposableArchitecture
 import SwiftUI
 
 @main
 struct DerivedBehaviorApp: App {
-    var body: some Scene {
-        WindowGroup {
-          VanillaContentView(
-            viewModel: .init()
-//            counterViewModel: .init(),
-//            profileViewModel: .init()
-          )
-        }
+  var body: some Scene {
+    WindowGroup {
+      TcaContentView(
+        store: Store(
+          initialState: .init(),
+          reducer: appReducer,
+          environment: .init()
+        )
+      )
     }
+  }
 }

0152-case-paths-performance/README.md

@@ -0,0 +1,7 @@
+## [Point-Free](https://www.pointfree.co)
+
+> #### This directory contains code from Point-Free Episode: [Composable Architecture Performance: Case Paths](https://www.pointfree.co/episodes/ep152-composable-architecture-performance-case-paths)
+>
+> This week we improve the performance of another part of the Composable Architecture ecosystem: case paths! We will benchmark the reflection mechanism that powers case paths and speed things up with the help of a Swift runtime function.
+
+For the section of the episode where we refactor the Case Paths, see [this GitHub pull request](https://github.com/pointfreeco/swift-case-paths/pull/35).