Promise generator combination

combine.js

const bluebird = require("bluebird");

const cop = bluebird.coroutine;

const exec = (time) => bluebird.delay(time).then(() => {
    console.log("Time done", time);
    return time;
});

function* start() {
    const promises = [
        bluebird.reject(),
        exec(100),
        exec(1000),
        exec(20),
        exec(120),
        bluebird.reject(),
    ];

    try {
        yield Promise.all(promises);
        console.log("Only if all promises are resolved");
    } catch (e) {
        console.log("Error captured", e);
    }

    console.log("Continue code here");

    return 0;
}

cop(start)();