SequentialPromise.js

clear();

var http = {
	get(url) {
        var delay = Math.floor( Math.random() * 10 ), even = !(delay % 2);
        var xhr = new Promise(exe);
		
		console.log(`REQUEST`, url, delay);
		xhr.then( (data) => console.log(`SUCCESS: `, data) ).catch( (data) => console.log(`FAILURE: `, data) );

        function exe(resolve, reject) {
			var action = { 'true': reject, 'false': resolve }[ even ];
            setTimeout( () => action({ url, delay }), (1000 * delay) );
        }

        return xhr;
    }
};

var SequentialPromise = new (function SequentialPromise() {
	var PRIVATE = this;

	return class SequentialPromise {
		
		constructor(context, action) {
			this.index = 0;
			this.requests = [ ];
			this.context = context;
			this.action = action;

			return this;
		}
		
		log() {}
		
		execute(url, ...more) {
			var { context, action, requests } = this;
			var chain = context[action](url);
			
			requests.push(chain);
			chain.then( (data) => this.index += 1 );
			
			if (more.length) return chain.then( () => this.execute(...more) );
			return chain;
		}
		
	};
})();

var sequence = new SequentialPromise(http, 'get');
var urls = [
	'url/name/space/0',
	'url/name/space/1',
	'url/name/space/2',
	'url/name/space/3',
	'url/name/space/4',
	'url/name/space/5',
	'url/name/space/6',
	'url/name/space/7',
	'url/name/space/8',
	'url/name/space/9'
];
var chain = sequence.execute(...urls);
var promises = sequence.requests;

chain.catch( () => console.warn(`EXECUTION STOPPED at ${sequence.index} for ${urls[sequence.index]}`) );

// console.log('>', chain, promises);