Promise.all() demonstration with iterations for refactoring

Promise-all.js

// Wait for ALL promises to return OR any to crash and then return the array of values to the caller of .all()

// // //Itteration 1
// // function runParallelPromisesSum() {
// // 	//Our function returns its own promise with our value that needed both the promises to return first
// // 	return new Promise( ( resolveAll, rejectAll ) => {

// // 		let promise1 = new Promise( ( resolvePromise1, rejectPromise1 ) => {
// // 				console.log("resolving 1");
// // 				resolvePromise1( 1 );
// // 			}),
// // 			promise2 = new Promise( ( resolvePromise2, rejectPromise2 ) => {
// // 				console.log("resolving 2");
// // 				resolvePromise2( 2 );
// // 			});

// // 		Promise.all( [ promise1, promise2 ] )
// // 			.then( values => {
// // 				console.log("resolved 1+2")
// // 				console.dir( values );
// // 				resolveAll( values[0] + values[1] );
// // 			})
// // 			.catch( err => {
// // 				console.dir( err );
// // 			});

// // 	});
// // }
// // runParallelPromisesSum().then( sum => { console.log( sum ) } );


// //Itteration 2
// ( function(){
// 	//Our function returns its own promise with our value that needed both the promises to return first
// 	return new Promise( ( resolveAll, rejectAll ) => {

// 		let promise1 = new Promise( ( resolvePromise1, rejectPromise1 ) => {
// 				console.log("resolving 1");
// 				resolvePromise1( 1 );
// 			}),
// 			promise2 = new Promise( ( resolvePromise2, rejectPromise2 ) => {
// 				console.log("resolving 2");
// 				resolvePromise2( 2 );
// 			});

// 		Promise.all( [ promise1, promise2 ] )
// 			.then( values => {
// 				console.log("resolved 1+2")
// 				console.dir( values );
// 				resolveAll( values[0] + values[1] );
// 			})
// 			.catch( err => {
// 				console.dir( err );
// 			});

// 	});
// })().then( sum => { console.log( sum ) } );


//Itteration 3 - success
( function( promises ){
	return new Promise( ( resolve, reject ) => {
		Promise.all( promises )
			.then( values => {
				console.log("resolved all promises")
				console.dir( values );
				resolve( values.reduce( (sum,value) => { return sum+value }) ); //Use Array.prototype.reduce() to sum the values in the array
			})
			.catch( err => {
				console.dir( err );
				throw err;
			});

	});
})([ 
	new Promise( ( resolve, reject ) => {
		console.log("resolving 1");
		resolve( 1 );
	}),
	new Promise( ( resolve, reject ) => {
		console.log("resolving 2");
		resolve( 2 );
	})
 ]).then( sum => { console.dir( { sum: sum } ) } )


.then( () => {
	//Itteration 3 - fail
	( function( promises ){
		return new Promise( ( resolve, reject ) => {
			Promise.all( promises )
				.then( values => {
					console.log("resolved all promises")
					console.dir( values );
					resolve( values.reduce( (sum,value) => { return sum+value }) ); //Use Array.prototype.reduce() to sum the values in the array
				})
				.catch( err => {
					console.dir( err );
					throw err;
				});

		});
	})([ 
		new Promise( ( resolve, reject ) => {
			console.log("resolving 1");
			resolve( 1 );
		}),
		new Promise( ( resolve, reject ) => {
			console.log("resolving 2");
			reject( 2 );
		})
	 ]).then( sum => { console.dir( { sum: sum } ) } )
})