es6-learning/Promises.html at master · vikrantraut/es6-learning · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>Promises in ES6</title>
</head>
<body>
	<h1>Promises in ES6</h1>
	 <p>Note: For output please check browser console using (Ctrl + Shift + i)</p>
</body>
<script>
	///Example 1
  var wait = new Promise((resolve,reject) =>{
    setTimeout(resolve, 1000);

  }).then(() =>{
     console.log("============Example 1 ========")
    console.log('Yes!...GO GO')
  })
  ///Example 2
    var wait10 = () => new Promise((resolve,reject) =>{
    setTimeout(resolve, 2000);
  })

  wait10()
  .then(() => {
   console.log("============Example 2 ========")
    console.log('Yes!!!!')
    return wait10()
  }).then(() => {
    console.log('Ya ya ya!!!!!!!!')
  })
 	///Example 3
  function delay(interval){
    return new Promise( (resolve) =>{
      setTimeout(resolve,interval);
    });
  }

  var SecondDelay = delay(5000);
   console.log("============Example 3 ========")
  console.log(SecondDelay)

///Example 4
    const promise = new Promise((resolve,reject) => {
    const request = new XMLHttpRequest();
    // const response = XMLHttpRequest.response;

    request.open("GET","https://api.icndb.com/jokes/random");
    request.onload = () => {
        if(request.status === 200 ){
          resolve(request.response);
        }else{
          reject(Error(request.statusText));
        }
      };

      request.onerror = () =>{
        reject(Error('Error fetching data.'));
      }

      request.send();
    });

    console.log("============Example 4 ========")
    console.log('Asynchronous request made.');

    promise.then(
      data => {
      console.log('Got data! Promise fulfilled.');
      document.body.textContent = JSON.parse(data).value.joke;
      },
      error => {
  console.log('Promise rejected.');
  console.log(error.message);
     }
    );

///Example 5
const isSmallNumber = (num) => {
  return new Promise((resolve,reject) => {
     if(num < 10){
      resolve(true)
     }else{
      reject(false)
     }
  })
}
setTimeout = () => {
console.log("============Example 5 ========")
isSmallNumber(12)
    .then(res => console.log('The number is smaller then 10'))
    .catch(err => console.log('The number is not smaller then 10'))
,4000};

//Example 6

const timeIn = (time) =>{
 return new Promise((resolve,reject) => {
  setTimeout( () => resolve (time),time);
 })
}
timeIn(2000)
.then( res => console.log(`Resloved in ${res/1000} seconds`))
console.log("============Example 6 ========")
</script>
</html>