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[] {
  // 返回渲染后的字符串数组
  const a = list.map(item => {
    return item.title
  })
  return a;
}
console.log(renderCourseLines(courses));

// 任务：
// 1. 实现 renderCourseLines
// 2. 输出结果