How do promises work in JavaScript?

Question

I just implemented my first function that returns a promise based on another promise in AngularJS, and it worked. But before I decided to just do it, I spent 2 hour

Answer 1

please check this simple promise code. this will help you to better understand of promise functionality.

A promise is an object that may produce a single value some time in the future: either a resolved value, or a reason that it’s not resolved. A promise may be in one of 3 possible states: fulfilled, rejected, or pending. Promise users can attach callbacks to handle the fulfilled value or the reason for rejection.

let myPromise = new Promise((resolve, reject)=>{
  if(2==2){
    resolve("resolved")
  }else{
    reject("rejected")
  }
});

myPromise.then((message)=>{
  document.write(`the promise is ${message}`)
}).catch((message)=>{
  document.write(`the promise is ${message}`)
})

check this out