gistfile1.txt

const Promise = require("bluebird");
const docClient = {
    put(x, cb) {
        setTimeout(() => {
            if (1 == x) {
                cb(null, "good");
            }
            else {
                cb(new Error("bad"));
            }
        }, 100);
    }
};

const promisedLib = Promise.promisifyAll(lib);

lib.put(1, (err, result) => console.log(result));
lib.put(0, (err, result) => console.log(err.message));

lib.putAsync(1)
    .then(result => console.log("\n===promises===\n\n", result))
    .then(() => lib.putAsync(1))
    .then(result => console.log(result))
    .then(() => lib.putAsync(0))
    .catch(err => console.error(err.message))