combined the data

Author: james-muriithi

helpers/combined-data.js

@@ -7,16 +7,46 @@ const deathsUrl = 'https://raw.githubusercontent.com/CSSEGISandData/COVID-19/mas
 
 let get_combine_data = () => {
     return Promise.all([get_data(casesUrl), get_data(recoveredUrl), get_data(deathsUrl)])
-        .then(result => {
-            //combine the data 
+        .then(([reportedData, recoveredData, deathsData]) => { // spread the response to 3 arrays
+            // get the dates from the first object of reportedData
+            const [province, country, lat, long, ...dates] = Object.keys(reportedData[0])
+
+            // loop through the reported data
+            reportedData.forEach(element => {
+                // for each country 
+                // the first 4 values are province, country, lat, long and the rest counts of cases per date
+                const [province, country, lat, long, ...counts] = Object.values(element)
+                    // find data of each country in the other 2 arrays
+                let recov = getCountryData(recoveredData, country)
+                let dths = getCountryData(deathsData, country)
+
+                // loop though the dates
+                dates.forEach((date, i) => {
+                    let reported = parseInt(counts[i])
+                    let recovered = recov.hasOwnProperty('Country/Region') ? parseInt(recov[date]) : 0
+                    let deaths = dths.hasOwnProperty('Country/Region') ? parseInt(dths[date]) : 0
+
+                    element[date] = {
+                        reported,
+                        recovered,
+                        deaths
+                    };
+                })
+            })
 
             // return combined data
-            return result
+            return reportedData
         })
         .catch(error => [{
             "message": "unable to load the data",
             'error': error
         }])
 }
 
+// get country data if it exists in the passed array
+let getCountryData = (countriesArray, country) => {
+    let countryData = {}
+    return countriesArray.find(element => element['Country/Region'].toString().toLowerCase() === country.toLowerCase())
+}
+
 module.exports = get_combine_data;