refactoring

docs/HistoDescrsProvider.js

@@ -0,0 +1,11 @@
+class HistoDescrsProvider {
+
+    static getHistoDescrsForBatchcode(batchcode) {
+        return fetch(`data/histograms/${batchcode}.json`)
+            .then(response => response.json())
+            .then(histoDescrs => {
+                histoDescrs.histograms.sort((histoDescr1, histoDescr2) => histoDescr1.batchcodes.length - histoDescr2.batchcodes.length);
+                return histoDescrs;
+            });
+    }
+}