TypeScript教育テクノロジー：学習プラットフォームの型安全性

            
function add(a, b) {
  return a + b;
}

console.log(add(5, "10")); // Output: "510" (unexpected string concatenation)

            

              
                Copy
              
            
          

            
function add(a: number, b: number): number {
  return a + b;
}

// console.log(add(5, "10")); // Error: Argument of type 'string' is not assignable to parameter of type 'number'.
console.log(add(5, 10)); // Output: 15

            

              
                Copy
              
            
          

            
interface User {
  id: number;
  username: string;
  email: string;
  role: 'student' | 'teacher' | 'administrator';
}

function grantAccess(user: User, resource: string): boolean {
  switch (user.role) {
    case 'administrator':
      return true; // Admins have access to everything
    case 'teacher':
      return resource.startsWith('/courses'); // Teachers can access course-related resources
    case 'student':
      return resource.startsWith('/lessons'); // Students can access lesson-related resources
    default:
      return false;
  }
}

const student: User = { id: 123, username: 'john.doe', email: 'john.doe@example.com', role: 'student' };
const teacher: User = { id: 456, username: 'jane.smith', email: 'jane.smith@example.com', role: 'teacher' };

console.log(grantAccess(student, '/lessons/introduction')); // true
console.log(grantAccess(student, '/courses/advanced')); // false
console.log(grantAccess(teacher, '/courses/advanced')); // true

            

              
                Copy
              
            
          

            
interface Course {
  id: number;
  title: string;
  description: string;
  modules: Module[];
}

interface Module {
  id: number;
  title: string;
  lessons: Lesson[];
}

interface Lesson {
  id: number;
  title: string;
  content: string;
}

function displayCourseDetails(course: Course): void {
  console.log(`Course: ${course.title}`);
  console.log(`Description: ${course.description}`);
  course.modules.forEach(module => {
    console.log(`\tModule: ${module.title}`);
    module.lessons.forEach(lesson => {
      console.log(`\t\tLesson: ${lesson.title}`);
    });
  });
}

const sampleCourse: Course = {
  id: 1,
  title: 'Introduction to Programming',
  description: 'A beginner-friendly course on programming fundamentals.',
  modules: [
    {
      id: 101,
      title: 'Variables and Data Types',
      lessons: [
        {
          id: 1001,
          title: 'What are Variables?',
          content: 'Explanation of variables...'
        },
        {
          id: 1002,
          title: 'Data Types in JavaScript',
          content: 'Explanation of data types...'
        }
      ]
    }
  ]
};

displayCourseDetails(sampleCourse);

            

              
                Copy
              
            
          

            
interface QuizState {
  currentQuestionIndex: number;
  userAnswers: string[];
  score: number;
  isFinished: boolean;
}

function startQuiz(questions: string[]): QuizState {
  return {
    currentQuestionIndex: 0,
    userAnswers: [],
    score: 0,
    isFinished: false
  };
}

function answerQuestion(state: QuizState, answer: string, correctAnswer: string): QuizState {
  const newState = { ...state }; // Create a copy of the state
  newState.userAnswers[state.currentQuestionIndex] = answer;
  if (answer === correctAnswer) {
    newState.score++;
  }
  newState.currentQuestionIndex++;
  newState.isFinished = newState.currentQuestionIndex >= questions.length;
  return newState;
}

//Example Usage

const quizQuestions = ["What is 2+2?", "What is the capital of France?"];
const correctAnswers = ["4", "Paris"];
let quizState = startQuiz(quizQuestions);

quizState = answerQuestion(quizState, "4", correctAnswers[0]);
quizState = answerQuestion(quizState, "London", correctAnswers[1]);

console.log("Final Score:", quizState.score);

            

              
                Copy
              
            
          

            
interface StudentPerformance {
  studentId: number;
  lessonId: number;
  score: number;
  timeSpent: number;
}

interface LearningRecommendation {
  lessonId: number;
  reason: string;
}

function recommendNextLesson(studentPerformance: StudentPerformance[]): LearningRecommendation {
  // (Simplified) Logic to determine next lesson based on performance
  if (studentPerformance.length === 0) {
    return { lessonId: 1, reason: "Start with the first lesson" };
  }

  const lastPerformance = studentPerformance[studentPerformance.length - 1];
  if (lastPerformance.score < 0.7) {
    return { lessonId: lastPerformance.lessonId, reason: "Review the previous lesson" };
  } else {
    return { lessonId: lastPerformance.lessonId + 1, reason: "Advance to the next lesson" };
  }
}

// Example Usage
const studentHistory: StudentPerformance[] = [
  { studentId: 1, lessonId: 1, score: 0.8, timeSpent: 600 },
  { studentId: 1, lessonId: 2, score: 0.6, timeSpent: 900 },
];

const nextLesson = recommendNextLesson(studentHistory);
console.log("Recommended Lesson:", nextLesson);

            

              
                Copy
              
            
          

            
interface ChatMessage {
  senderId: number;
  senderName: string;
  content: string;
  timestamp: Date;
}

function displayMessage(message: ChatMessage): string {
  return `${message.senderName} (${message.timestamp.toLocaleTimeString()}): ${message.content}`;
}

// Example Usage

const newMessage: ChatMessage = {
  senderId: 123,
  senderName: 'Alice',
  content: 'Hello, everyone!',
  timestamp: new Date()
};

console.log(displayMessage(newMessage));

            

              
                Copy