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yiourkas / Worldometer-covid-enhancer

// ==UserScript==
// @name         Worldometer-covid-enhancer
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @license      MIT
// @match        https://www.worldometers.info/coronavirus/
// @grant        none
// @run-at document-body
// ==/UserScript==

var setup = function() {
    'use strict';

	var parseNumber = function(t) {
		t = t.replace(',', '');
		return parseInt(t) || 0;
	};

    var table = document.getElementById('main_table_countries_today');

    var headRow = table.tHead.rows[0];

	{
		let th_cell1 = document.createElement("th");
    	headRow.appendChild(th_cell1);
    	th_cell1.appendChild(document.createTextNode("Deaths / Cases"));
	}
	{
		let th_cell1 = document.createElement("th");
    	headRow.appendChild(th_cell1);
    	th_cell1.appendChild(document.createTextNode("Deaths / 1M pop"));
	}

	{
		let th_cell1 = document.createElement("th");
    	headRow.appendChild(th_cell1);
    	th_cell1.appendChild(document.createTextNode("Deaths / (Deaths+Recovered)"));
	}

	var enrichRow = function(row) {
		let totalCases = parseNumber(row.cells[1].innerHTML);
		let casesPer1M = parseNumber(row.cells[8].innerHTML);
		let totalDeaths = parseNumber(row.cells[3].innerHTML);
        let totalRecovered = parseNumber(row.cells[5].innerHTML);

		// "Deaths / Cases"
		let cell = row.insertCell(row.cells.length);
		if (totalDeaths == 0 || totalCases == 0) {
			cell.appendChild(document.createTextNode(""));
		} else {
			cell.appendChild(document.createTextNode(
				(Math.round((totalDeaths / totalCases) * 10000) / 100).toFixed(2) + " %"));
		}

		// "Deaths / 1M pop"
		cell = row.insertCell(row.cells.length);
		if (totalDeaths == 0 || totalCases == 0 || casesPer1M == 0) {
			cell.appendChild(document.createTextNode(""));
		} else {
			let fnum = totalDeaths / (totalCases / casesPer1M);
			cell.appendChild(document.createTextNode(Math.round(fnum * 100).toFixed(2) / 100));
		}

		// "Deaths / (Deaths+Recovered)"
		cell = row.insertCell(row.cells.length);
		if (totalDeaths == 0 || totalCases == 0 || casesPer1M == 0) {
			cell.appendChild(document.createTextNode(""));
		} else {
			let fnum = totalDeaths / (totalDeaths + totalRecovered);
			cell.appendChild(document.createTextNode(Math.round(fnum * 100).toFixed(2) / 100));
		}
	};

	for (var i = 0, row; row = table.tBodies[0].rows[i]; i++) {
		enrichRow(row);
    }

	enrichRow(document.getElementById('main_table_countries_today').tBodies[1].rows[0]);
};

$(document).ready(setup);