Start the process of splitting JS files

I am a JS noob so this is probably poorly thought out. But it is a wip and I dont really care about the quality, just more the learning experience.

src/fetchData.js

@@ -0,0 +1,13 @@
+import Datum from "./datum";
+import urlBuilder from "./urlBuilder";
+
+export default async function fetchData(currentRegionSelection, currentTimeSelection, currentAggregateSelection) {
+    const data = [];
+    const resp = await fetch(urlBuilder(currentRegionSelection, currentTimeSelection, currentAggregateSelection));
+    const respData = await resp.json();
+    for (let i = 0, l = respData.length; i < l; i++) {
+        let datum = new Datum(Date.parse(respData[i]['time']), respData[i]['value']);
+        data.push(datum);
+    }
+    return data;
+}