Statistic calculation for "a" word

Toki Trainer/Views/FlashCardResultsView.swift

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+//
+//  FlashCardResultView.swift
+//  Toki Trainer
+//
+//  Created by Avery Ada Pace on 11/7/21.
+//
+
+import SwiftUI
+
+struct FlashCardResultsView: View {
+    @Environment(\.managedObjectContext) private var viewContext
+
+    @FetchRequest(entity:FlashCardAnswer.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \FlashCardAnswer.word, ascending: false)], predicate: NSPredicate(format: "word == %@", "a")) var flashCardAnswers: FetchedResults<FlashCardAnswer>
+
+    @State private var statistics = 0.0
+    
+    func calculateStatistics() {
+        print("count: \(flashCardAnswers.count)")
+        for answer in flashCardAnswers {
+            if answer.triesCount != 0 {
+                print("word: \(answer.word)")
+                print("tries: \(answer.triesCount)")
+                print("correct: \(answer.correctCount)")
+                self.statistics = Double(answer.correctCount) / Double(answer.triesCount)
+            }
+        }
+    }
+    
+//    func calculateStatistics() {
+//        var correctAnswers = 0
+//        for answer in flashCardAnswers {
+//            if answer.correct {
+//                correctAnswers += 1
+//            }
+//            self.statistics = Double(correctAnswers) / Double(flashCardAnswers.count)
+//        }
+//    }
+    
+    var body: some View {
+        Text("Percentage: \(statistics)")
+            .onAppear {
+                calculateStatistics()
+            }
+    }
+}
+
+struct FlashCardResultView_Previews: PreviewProvider {
+    static var previews: some View {
+        FlashCardResultsView()
+    }
+}