function p1(args) {
    return new Promise((resolve, reject) => {
        args.b = 10;
        // throw Error('aaaahhhhhh')
        setTimeout(() => resolve(args), 100);
    });
}

function p2(args) {
    args.c = 20;
    return Promise.resolve(args);
}

function p(args) {
    return new Promise((resolve, reject) => {
       setTimeout(() => resolve(args), 100);
    });
}

p({ a: 1, b: 2 })
    .then(p1)
    .then(p2)
    .then(result => console.log(result))
    .catch(error => console.log(error.message));