Hello, Promises !

Data Will Receive after 60 Second

JavaScript File :

       
document.writeln("Hello, Promises 


");


// Promises ,first resolve and reject, then ..... then, catch , finally

// Creating a Promise
const myPromise = new Promise((resolve, reject) => {
  const success = true; // Change to false to see reject
  
  // Simulating an async operation (e.g., API call, file read)
  setTimeout(() => {
    if (success) {
      resolve("Operation successful! Data received.");
    } else {
      reject("Operation failed! Error occurred.");
    }
  }, 60000);
});

// Using the Promise
myPromise
  .then((result) => {
    document.writeln("Success:", result); // Runs when promise resolves
  })
  .catch((error) => {
    document.writeln("Error:", error); // Runs when promise rejects
  })
  .finally(() => {
    document.writeln("Promise settled - cleanup done"); // Always runs
  });


// Fetch Returns Promise, Promise to solve or rejects
// Promise All , Promise Any, Promise race ....

// if one reject , second one resolve !
// const p1 = Promise.resolve("Data From Resolve, Promise 1");
const p1 = Promise.reject("Data From Resolve, Promise 1");

const p2 = Promise.resolve("Data From promises 2 !");

Promise.any([p1, p2])
.then((data) => document.writeln(data));



// Set timeout , Promises , with Race

const p3 = new Promise((resolve) => setTimeout(() => 
       {resolve("Data from p3 !")}, 10000
));
const p4 = new Promise((resolve) => setTimeout(() => 
       {resolve("Data from p4 !")}, 1000
));

// Promise.race([p3, p4])
// .then((data) => document.writeln(data));
// uncomment to run program, coz remove first program..


// Promise.allSettled([p3, p4]).then((data) => document.writeln(data));

// Learn Promises ..
// Practise, Practise, Practise ..........

// Self Study, Only 12-14 lecture of Javascript and React , SO Study 2-3 w3 and practise more ......



const newPromises = new Promise((resolve, reject) => {
    const test = true;
    setTimeout(() => {
         if(test) {
            resolve("The Query is Resolve");
         }
         else{
            reject("The Query is Rejected !")
         }
    }, 2000)
})

newPromises
.then(() => {
    document.writeln("The Query is Solved, From Then")
})
.catch(() => {
    document.writeln("The Query is Rejected from Catch!")
})

  

JavaScript Output :