refactor: Move data structure functions into its own module

src/components/summaryviewer.js

@@ -5,6 +5,7 @@ import ReactInterval from 'react-interval';
 // XXX: Create module that fetches ccov data + diff data
 import { coverageSummaryText } from './diffviewermeta';
 import * as FetchAPI from '../utils/fetch_data';
+import { arrayToMap, mapToArray } from '../utils/data';
 
 const PENDING = 'Pending';
 
@@ -54,18 +55,6 @@ const PollingStatus = ({ pollingEnabled }) => (
     </div>) : (null)
 );
 
-const arrayToMap = (csets) => {
-  const newCsets = {};
-  csets.forEach((cset) => {
-    newCsets[cset.node] = cset;
-  });
-  return newCsets;
-};
-
-const mapToArray = csets => (
-  Object.keys(csets).map(node => csets[node])
-);
-
 const csetWithCcovData = async (cset) => {
   if (!cset.node) {
     throw Error(`No node for cset: ${cset}`);

src/utils/data.js

@@ -0,0 +1,11 @@
+export const arrayToMap = (csets) => {
+  const newCsets = {};
+  csets.forEach((cset) => {
+    newCsets[cset.node] = cset;
+  });
+  return newCsets;
+};
+
+export const mapToArray = csets => (
+  Object.keys(csets).map(node => csets[node])
+);