The getJoke function imports required modules and makes a GET request to a web page to retrieve a list of jokes, extracting the questions and answers using regular expressions. It then returns a random joke from the list, or resolves with the existing joke data if it has already been loaded.

Run example

npm run import -- "tell joke"

tell joke

var util = require('bluebird');
var request = util.promisify(require('request'));
var importer = require('../Core')

var jokes;
function getJoke() {
    // TODO: collect jokes instead
    return (typeof jokes === 'undefined'
        ? request('http://www.ducksters.com/jokes/silly.php')
        .then(res => importer.regexToArray(/^.*?Q:.*$|^.*?A:.*$/igm, res.body))
        .then(r => {
            r = r.reduce((arr, j, i) => {
                if(i % 2 === 1) {
                    arr.push([
                        r[i-1].replace(/<.*?\s*\/?>/ig, '').trim().replace(/^\s*|\s*$/igm, ''),
                        j.replace(/<.*?\s*\/?>/ig, '').trim().replace(/^\s*|\s*$/igm, '')
                    ]);
                }
                return arr;
            }, []);
            console.log(r);
            jokes = r;
            return r;
        })
        : Promise.resolve(jokes))
        .then(arr => {
            const i = Math.round(Math.random() * arr.length);
            return arr[i];
        })
}
module.exports = getJoke;

```javascript
const request = require('request'). defaults({ jar: true });
const { regexToArray } = require('../Core');

/**
 * Returns a random joke from a collection of silly jokes.
 * @returns {Promise<Array<string>>} A promise resolving to an array of jokes.
 */
function getJoke() {
    // Cache jokes to avoid repeated requests
    const cacheKey ='silly-jokes';
    const cachedJokes = globalThis.localStorage.getItem(cacheKey);

    if (cachedJokes) {
        return Promise.resolve(JSON.parse(cachedJokes));
    }

    return new Promise((resolve, reject) => {
        request('http://www.ducksters.com/jokes/silly.php', (error, response, body) => {
            if (error) {
                reject(error);
            } else if (response.statusCode === 200) {
                const regex = /^.*?Q:.*$|^.*?A:.*$/igm;
                const jokes = regexToArray(regex, body);

                // Pair up question and answer
                const pairedJokes = jokes.reduce((arr, j, i) => {
                    if (i % 2 === 1) {
                        arr.push([j.replace(/<.*?\s*\/?>/ig, '').trim().replace(/^\s*|\s*$/igm, ''), jokes[i - 1].replace(/<.*?\s*\/?>/ig, '').trim().replace(/^\s*|\s*$/igm, '')]);
                    }
                    return arr;
                }, []);

                // Store jokes in cache
                globalThis.localStorage.setItem(cacheKey, JSON.stringify(pairedJokes));

                resolve(pairedJokes);
            } else {
                reject(new Error(`Request failed with status code ${response.statusCode}`));
            }
        });
    })
   .then((jokes) => {
        const randomJokeIndex = Math.floor(Math.random() * jokes.length);
        return jokes[randomJokeIndex];
    });
}

module.exports = getJoke;
```

Code Breakdown

Importing Modules

var util = require('bluebird');
var request = util.promisify(require('request'));
var importer = require('../Core')

• The bluebird library is imported and assigned to the util variable.
• The request module is imported and its promisify method is used to convert it into a Promise-based function.
• The importer module is imported from a relative path.

Defining the getJoke Function

var jokes;
function getJoke() {
    //...
}

• The getJoke function is defined.
• A jokes variable is declared.

Resolving Jokes

return (typeof jokes === 'undefined'
   ? request('http://www.ducksters.com/jokes/silly.php')
   .then(res => importer.regexToArray(/^.*?Q:.*$|^.*?A:.*$/igm, res.body))
   .then(r => {
        //...
    })
    : Promise.resolve(jokes))
   .then(arr => {
        //...
    })

• If jokes is undefined, the function makes a GET request to http://www.ducksters.com/jokes/silly.php using the request function.
• The response body is then processed using importer.regexToArray function, which extracts questions and answers from the response body.
• The extracted data is then cleaned and stored in the jokes variable.
• If jokes is defined, the function resolves with the existing jokes data.

Returning a Random Joke

.then(arr => {
    const i = Math.round(Math.random() * arr.length);
    return arr[i];
})

• A random index i is generated based on the length of the arr array.
• The joke at the random index i is returned.

Exporting the Function

module.exports = getJoke;

• The getJoke function is exported as a module.