create new format for dates

src/formatDate.js

@@ -8,7 +8,31 @@
  * @returns {string}
  */
 function formatDate(date, fromFormat, toFormat) {
-  // write code here
+  const oldDivider = fromFormat[3];
+  const newDivider = toFormat[3];
+  const dateParts = date.split(oldDivider);
+  const dateData = {};
+  const newFormat = [];
+
+  for (let i = 0; i < fromFormat.length - 1; i++) {
+    dateData[fromFormat[i]] = dateParts[i];
+  }
+
+  if (dateData.hasOwnProperty('YYYY')) {
+    dateData.YY = dateData.YYYY.slice(2);
+  }
+
+  if (dateData.YY < 30) {
+    dateData.YYYY = '20' + dateData.YY;
+  } else {
+    dateData.YYYY = '19' + dateData.YY;
+  }
+
+  for (let i = 0; i < toFormat.length - 1; i++) {
+    newFormat.push(dateData[toFormat[i]]);
+  }
+
+  return newFormat.join(newDivider);
 }
 
 module.exports = formatDate;