create util/parseTransactions.js

add parse functions for json and csv

src/renderer/util/parseTransactions.js

@@ -0,0 +1,31 @@
+function parseJson(data) {
+  return JSON.stringify(data);
+}
+
+function parseCsv(data) {
+  // Get items for header
+  const getHeaders = temp =>
+    Object.entries(temp)
+      .map(([key]) => key)
+      .join(',');
+  // Get rows content
+  const getData = list =>
+    list
+      .map(item => {
+        const row = Object.entries(item)
+          .map(([key, value]) => value)
+          .join(',');
+        return row;
+      })
+      .join('\n');
+  // Return CSV string
+  return `${getHeaders(data[0])} \n ${getData(data)}`;
+}
+
+export function parseTransactions(transactions, format) {
+  const formats = {
+    csv: data => parseCsv(data),
+    json: data => parseJson(data),
+  };
+  return formats[format] ? formats[format](transactions) : undefined;
+}