no_throw_example.js

'use strict';
const co = require("./co.js");
const co_nothrow = require("./co-nothrow");


var boom = ()=> {
	return new Promise((resolve, reject)=>{
		setTimeout(()=>{
			reject("boom");
		}, 1000);
	})
};


co(function *() {
	try {
		yield boom();
		console.log("[co] done");
	} catch (e) {
		console.error("[co] error:", e);
	}
});

co_nothrow(function *() {
	let [err, res] = yield boom();
	console.log("[co no-throw] done:", err, res);
});

console output

[co] error: boom
[co no-throw] done: boom null