covid.js

const rp = require('request-promise')
const baseUrl = 'https://api.covid19api.com/'
const {getCases, getCountryNames} = require('./request')

//request.js
const doMakeRequest = async (endpoint) => {
    const res = await rp(`${baseUrl}${endpoint}`)
    return JSON.parse(res)
}

const getCases = async (slug) => {
    return doMakeRequest(`/live/country/${slug}/status/confirmed`)
}

const getCountryNames = async () => {
    const countries = await doMakeRequest('/countries')
    return countries.map(c => c.Slug)
}

const main = async () => {
    const names = await getCountryNames()
    const cases = names.map(getCases)

    return avgDeaths(Promise.all(cases))
}

const avgDeaths = (countries) => {
    const validCountries = countries.filter(country => country.length != 0)
    const deaths = validCountries.map(c => c.pop().Deaths)

    return avg(deaths)
}


//Utils.js
const sum = numbers => numbers.reduce((acc, num) => acc + num)
const avg = (numbers) => sum(numbers) / numbers.length

main.then(console.log)