new Promise((resolve, reject) => {

    console.log('Initial');

​

    resolve();

})

.then(() => {

    throw new Error('Something failed');

​

    console.log('Do this');

})

.catch(() => {

    console.error('Do that');

})

.then(() => {

    console.log('Do this, no matter what happened before');

});

​

let conditions=true;

​

​

const proms= new Promise((resolve, reject) => {

    setTimeout(() => {

        if (conditions) {

            resolve ("Hello")

        } else {

            reject ("This condition faild")

        }

    }, 2000);

});

​

​

proms.then((result) => {

    console.log(result);

})

.catch(function(error){

    console.log(error);

});

​

​

var promise = new Promise(function(resolve, reject) {

  // do some long running async thing…

  if (/* everything turned out fine */) {

    resolve("Stuff worked!");

  }

  else {

    reject(Error("It broke"));

  }

});

​

//usage

promise.then(

  function(result) { /* handle a successful result */ },

  function(error) { /* handle an error */ }

);

let promise = new Promise((resolve,reject)=>{

                try {

                    resolve("some data");

                } catch (error) {

                    reject(error);

                }

            })

            promise.then(function (data) {

                console.log(data);

            },function (error) {

                console.error(error);

            })

const fetchData = () => {

  fetch('https://api.github.com').then(resp => {

    resp.json().then(data => {

      console.log(data);

    });

  });

};

let num = 10;

//call back function

const promis = new Promise(function (resolve, reject) {

​

  if (num > 5) {

​

    //this resolve method will send data to resoleveData variable

    resolve(" Problem resolved successfully")

  }

  else {

    //this reject method will send data to rejectData variable

    reject("sorry problem couldn't solve")

  }

​

})

//resoleveData variable

promis.then(function (resolveData) {

​

  console.log(resolveData)

  //rejectData variable

}).catch(function (rejectData) {

​

  console.log(rejectData)

})

​

let promise = new Promise(function(resolve, reject){

  try{

    resolve("works"); //if works

  } catch(err){

    reject(err); //doesn't work

  }

}).then(alert, console.log); // if doesn't work, then console.log it, if it does, then alert "works"

const executorFunction = (resolve, reject) => {

  if (someCondition) {

      resolve('I resolved!');

  } else {

      reject('I rejected!'); 

  }

}

const myFirstPromise = new Promise(executorFunction);

const prom = new Promise((resolve, reject) => {

  resolve('Yay!');

});

const handleSuccess = (resolvedValue) => {

  console.log(resolvedValue);

};

prom.then(handleSuccess); // Prints: 'Yay!'

/*

Promise is a constructor function, so you need to use the new keyword to 

create one. It takes a function, as its argument, with two parameters - 

resolve and reject. These are methods used to determine the outcome of the

promise. 

The syntax looks like this:

*/

​

const myPromise = new Promise((resolve, reject) => {

​

});

​

​