delay[nancy].js

const delay = milliseconds => new Nancy(resolve => setTimeout(resolve, milliseconds));
const logThenDelay = milliseconds => total => {
    console.log(`${total / 1000.0} seconds!`);
    return delay(milliseconds)
        .then(() => total + milliseconds);
};

logThenDelay(500)(0) // logs 0 seconds!
    .then(logThenDelay(500)) // after 0.5 seconds, logs 0.5 seconds!
    .then(logThenDelay(500)) // after 1 second, logs 1 seconds!
    .then(logThenDelay(500)); // after 1.5 seconds, logs 1.5 seconds!