async/await request example

hello-async.js

const fs = require('fs');
const request = require('request');

function fetch(url) {
    return new Promise(function(resolve) {
        request(url, function(error, response, body) {
            resolve(JSON.parse(body));
        });
    });
}

function fetchAll(urls) {
    return Promise.all(urls.map(function(url) {
        return fetch(url);
    })); 
}

function flatten(array) {
    return array.reduce(function(prev, current) {
        const images = current.message;
        
        return prev.concat(images);
    }, []);
}

function prettyify(json) {
    return JSON.stringify(json, null, 2);
}

function writeFile(file, data) {
    fs.writeFile(file, data, 'utf8', function() {
        console.log('File Saved!');
    });
}

async function main() {
    var urls = [
        'https://dog.ceo/api/breed/akita/images/random/10',
        'https://dog.ceo/api/breed/chow/images/random/10',
        'https://dog.ceo/api/breed/dhole/images/random/10',
        'https://dog.ceo/api/breed/dingo/images/random/10',       
        'https://dog.ceo/api/breed/eskimo/images/random/10'
    ];

    const json = await fetchAll(urls);
    const flattenedJson  = flatten(json);
        
    writeFile('dogs.json', prettyify(flattenedJson, null, 2));
}

main();