get weakest link

get-weakest-link.ts

/*
 * This script searches for the 'weakest link' in an array.
 * It can be usefull when looking for the combined status of a download all action. 
 * Try it here: https://stackblitz.com/edit/typescript-ose5xy
*/

const orderedStatusses = ['failed', 'unknown', 'queued', 'downloading', 'completed'];

const mappedStatussesFromAStreamOfAssets = ['completed', 'failed', 'completed', 'completed'];

const reduceStatusses = (acc, curr) => {
    const statusIndex = Math.min(orderedStatusses.indexOf(acc), orderedStatusses.indexOf(curr));
    return orderedStatusses[statusIndex] || orderedStatusses[1];
}

const weakestLink = mappedStatussesFromAStreamOfAssets.reduce(reduceStatusses) || orderedStatusses[1];
console.log(weakestLink);
// -> 'failed'