post_6

promise_3.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);
  });
}

function fetchUserComments(user: string): Promise<string[]> {
  return new Promise((resolve) => {
    setTimeout(() => {
      const comments = ["Comment 1", "Comment 2"];
      resolve(comments);
    }, 1000);
  });
}

Promise.all([
  fetchUser(1),
  fetchUserPosts("John Doe"),
  fetchUserComments("John Doe"),
])
  .then(([user, posts, comments]) => {
    console.log("User:", user);
    console.log("User Posts:", posts);
    console.log("User Comments:", comments);
  })
  .catch((error) => {
    console.error("Error:", error);
  });
  
// Output:
// User: Sung-Jie Hung
// User Posts: [ 'Post 1', 'Post 2', 'Post 3' ]
// User Comments: [ 'Comment 1', 'Comment 2' ]