gistfile1.txt

import SwiftUI

// MARK: - Data Models

// Struct for representing a student
struct Student: Identifiable {
    let id = UUID()
    let name: String
    let age: Int
    let grades: [Double]
}

// Struct for representing processed student information
struct StudentInfo: Identifiable {
    let id = UUID()
    let averageGrade: Double
    let name: String
}

// MARK: - Sample Data
let students = [
    Student(name: "Alice", age: 20, grades: [90.0, 85.0, 70.0]),
    Student(name: "Bob", age: 17, grades: [70.0, 60.0, 80.0]), // Will be filtered out
    Student(name: "Charlie", age: 22, grades: [95.0]), // Needs penalty grades
    Student(name: "Dave", age: 18, grades: [88.0, 92.0, 80.0]),
    Student(name: "Eve", age: 19, grades: [77.0, 66.0]) // Needs one penalty grade
]

// Part 1
// MARK: - Data Processing Function
// Implement a function to process an array of Student objects into an array of StudentInfo objects.
// Requirements:
// - Filter out students younger than 18 years old.
// - Ensure each student has exactly three grades (add a penalty grade of 50.0 if fewer than three).
// - Calculate the average grade from exactly three grades.
// - Sort the resulting list by average grade in descending order, and by name in ascending order if grades are equal.
func processStudents(students: [Student]) -> [StudentInfo] {
    let studentsFilteredByAge = students.filter({ $0.age < 19 })
    
    let studentInfoArray: [StudentInfo] = studentsFilteredByAge.map { student in
        var grades = student.grades
        while grades.count < 3 {
            grades.append(50.0)
        }
        let averageGrades = grades.reduce(0, +) / 3
        
        return StudentInfo(averageGrade: averageGrades, name: student.name)
    }
    
    let sortedStudents = studentInfoArray
        .sorted(by: { 
            if $0.averageGrade == $1.averageGrade {
                $0.name < $1.name
            } else {
                $0.averageGrade > $1.averageGrade 
            }
        })
    
    return sortedStudents
}

// Part 2 (Time allowing)
// MARK: - SwiftUI View
// ContentView: Implement a SwiftUI view named ContentView.
// Requirements:
// - Display a list of StudentInfo objects.
// - Show each student's name and their average grade formatted to two decimal places.
struct ContentView: View {
    @State var studentInfoList: [StudentInfo] = []
    var body: some View {
        VStack {
            List {
                ForEach(studentInfoList) { studentInfo in 
                    HStack {
                        Text(studentInfo.name)
                        Text("\(studentInfo.averageGrade)")
                    }
                }
            }
        }
        .onAppear {
            loadStudentsData()
        }
    }
    
    @MainActor
    func loadStudentsData() {
        studentInfoList = processStudents(students: students)
    }
}

// MARK: - SwiftUI Preview
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}