1A promise is an object that may produce a single value sometime in the future: either a resolved value, or a reason that it's not resolved (e.g., a network error occurred)

1Promises make async javascript easier as they are easy to use and write than callbacks. Basically , promise is just an object , that gives us either success of async opertion or failue of async operations

1getData()
2    .then(data => console.log(data))
3    .catch(error => console.log(error));

1var posts = [
2  {name:"Mark42",message:"Nice to meet you"},
3  {name:"Veronica",message:"I'm everywhere"}
4];
5
6function Create_Post(){
7  setTimeout(() => {
8    posts.forEach((item) => {
9      console.log(`${item.name} --- ${item.message}`);
10    });
11  },1000);
12}
13
14function New_Post(add_new_data){
15  return new Promise((resolve, reject) => {
16    setTimeout(() => {
17     posts.push(add_new_data);
18      var error = false;
19      if(error){
20        reject("Something wrong in </>, Try setting me TRUE and check in console");
21      }
22      else{
23        resolve();
24      }
25    },2000);
26  })
27}
28
29New_Post({name:"War Machine",message:"I'm here to protect"})
30    .then(Create_Post)
31    .catch(err => console.log(err));