promise.me.js

let p = new Promise((resolve, reject) => resolve() )
.then( () =>{
	let ARR = [0];
	return ARR;
})
.then( (ARR) =>{
	ARR.push(1);
	let p_inner = new Promise(
		(inner_resolve, inner_reject) =>{
			ARR.push(2);
			inner_resolve(ARR);
		})
	.then( (ARR) =>{
		ARR.push(3);
		return ARR;
	})
	.then( (ARR) =>{
		let double_nested = new Promise((resolve, reject) => resolve() )
		.then( () => {
			ARR.push(4);
			return ARR;
		})
		return double_nested;
	})
	.then( (ARR) =>{
		ARR.push(5);
		return ARR;
	})
	.catch( (result) =>
		'err ' + result
	);
	return p_inner;
})
.then( (result) => 
	console.log(result)
)