Hacking instaTeam web api

instaTeam.js

/////////////////////////////////////////////////////////////////////////////////////////
//first some helper functions to tee up one last clean routine at the bottom

//from: https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep/39914235#39914235
const sleep = s => new Promise(resolve => setTimeout(resolve, s * 1000));

//from:https://stackoverflow.com/questions/37576685/using-async-await-with-a-foreach-loop/49432189#49432189
Array.prototype.forEachAsync = async function (fn) { for (let t of this) { await fn(t) } }

//get data
const instaGet = url => fetch(url).then(response => response.json());

//post data
const instaPost = (url, dataObj) => fetch(url, { method: "POST", headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(dataObj) }).then(response => response.json()).then(result => console.log(result));

/////////////////////////////////////////////////////////////////////////////////////////

//get the full list of scheduled events
const fullSchedule = await instaGet("/api/team/schedule/list?v=2&paidEvents=0");

//flatten out their nested datastructure into an clean array of event objects
const events = fullSchedule.schedulesByDate.map(s => s.schedules).flat();

//attendance === 3 means not yet attending
//so this final expression filters on those events not yet booked,
//and calls the web api to flip her on for attending
await  events.filter(e => e.childrenAttendance[0].attendance === 3).forEachAsync(async (e) => {
    console.log("attend " +e.scheduleId+ " posting...");
    await instaPost("/api/team/schedule/attend", {
        "scheduleId": e.scheduleId,
        "attend": "yes", // **** here's the beef! *****************************************************
        "memberId": "xxxxxxx"
    });
    await sleep(2);
});
console.log("DONE!");