bluebird_vs_co.js

(function()
{
	"use strict";

	function test(label, co)
	{
		let times = 3000;
		function * g1(){ return 1; }
		function * g2()
		{
			let val = yield g1();
			return 2 + val;
		}
		function * gMain()
			{
				// require('./bad.js'); // syntax error
				let val = 3;
				for(let i = 0; i < times; ++ i)
					val += yield g2();
				return val;
			};

		console.time(label);
		return co(gMain)
			.then(val =>
			{
				console.log(`${label} result = ${val}`);
				console.timeEnd(label);
			})
			.catch(err =>
			{
				console.timeEnd(label);
				console.log(err.message);
				console.log(err.stack);
			});
	}

	let co = require('co');
	let bluebird = require("bluebird");
	let manual = require('bluebird-co/manual');
	bluebird.coroutine.addYieldHandler(manual.toPromise);
	let bluebirdCo = gen => bluebird.coroutine(gen)();

	Promise.resolve(true)
		.then(() => test('co', co))
		.then(() => test('bluebird', bluebirdCo))
		.then(() => console.log('… finished'))
		.catch(e => console.log(e.message, e.stack));
})();