nodejs async await for noob like me

gistfile1.txt

const { promisify } = require("util");

function Foo() {

    this.one = promisify(
        function(value, callback) {
            setTimeout(() => {
                console.log("one", value);
                callback(null, true);
            }, 500);
        }
    );

    this.two = promisify(
        function(value, callback) {
            setTimeout(() => {
                console.log("two", value);
                callback(null, true);
            }, 500);
        }
    );

    this.err = promisify(
        function(value, callback) {
            callback("hooo shiiit");
        }
    );

    return this;
}


async function go() {
    let foo = new Foo();
    try {
        await foo.one("myone");
        await foo.two("mytwo");
        await foo.err("hu");
    } catch(e) {
        console.log("error: ",e);
    }
}

go();

const { promisify } = require("util");

function Foo() {

    let self = this;

    this.show = (value, callback) => {
        setTimeout(() => {
            console.log(value);
            callback(null, true);
        }, 500);
    }

    this.err = (value, callback) => {
        callback(value);
    }

    this.show = promisify(this.show);
    this.err = promisify(this.err);

    return this;
}


async function start() {
    let foo = new Foo();
    try {
        await foo.show("one");
        await foo.show("two ...");
        await foo.err("you will NOT pass");
        await foo.show("three !");
    } catch(e) {
        console.log("error: ",e);
    }
}

start();