post_6

promise_2.ts

function fetchUser(userId: number): Promise<string> {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (userId === 1) {
        resolve("Sung-Jie Hung");
      } else {
        reject("User not found");
      }
    }, 2000);
  });
}

function fetchUserPosts(user: string): Promise<string[]> {
  return new Promise((resolve) => {
    setTimeout(() => {
      const posts = ["Post 1", "Post 2", "Post 3"];
      resolve(posts);
    }, 1500);
  });
}

fetchUser(1)
  .then((user) => {
    console.log("User:", user);
    return fetchUserPosts(user);
  })
  .then((posts) => {
    console.log("User Posts:", posts);
  })
  .catch((error) => {
    console.error("Error:", error);
  });

// Output:
// User: Sung-Jie Hung
// User Posts: [ 'Post 1', 'Post 2', 'Post 3' ]