unitTestFuncs.js

const axios = require('axios');

const flattenArr = (arr) => {
    const retVal = [];

    const helper = (val) => {
        for (let i = 0; i < val.length; i++) {
            if (Array.isArray(val[i])) {
                helper(val[i]);
            } else {
                retVal.push(val[i]);
            }
        }
    };

    helper(arr);
    return retVal;
};

const dataFetcher = async () => {
    try {
        const data = await axios.get(
            'https://jsonplaceholder.typicode.com/users'
        );
        return data;
    } catch (e) {
        throw new Error({ error: e, message: 'An Error Occurred' });
    }
};

const createList = (arr, sortFn) => {
    if (sortFn && arr.length > 1) {
        return sortFn(arr);
    }

    return arr;
};

module.exports = {
    flattenArr,
    dataFetcher,
    createList,
};