interface Course {
  title: string;
  lessons: number;
  finished: boolean;
}

const courses: Course[] = [
  { title: "TypeScript 基础", lessons: 8, finished: true },
  { title: "接口和泛型", lessons: 6, finished: false },
];

function renderCourseLines(list: Course[]): string[] {
  return list.map((course) => {
    const status = course.finished ? "已完成" : "学习中";
    return `${course.title} - ${course.lessons} 节 - ${status}`;
  });
}

console.log(renderCourseLines(courses));