Promises in JS

alt-promises.js

var promise = new Promise(function(resolve, reject) { 
	throw new Error('Some error has occured') 
}) 

promise 
	.then(function(successMessage) { 
		console.log(successMessage); 
	}) 
	.catch(function(errorMessage) { 
	//error handler function is invoked 
		console.log(errorMessage); 
	}); 

promises-failed.js

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

promise 
	.then( (successMessage) => { 
		console.log(successMessage); 
	})
  .catch((errorMessage) => {
    console.log(errorMessage); 
  }); 

promises-fullfilled.js

var promise = new Promise(function(resolve, reject) { 
    resolve('Geeks For Geeks'); 
}) 
  
promise 
    .then((successMessage) => { 
       //success handler function is invoked 
        console.log(successMessage); 
    });