From 8ba41017470590a614cf513b33f450f08bc07ca3 Mon Sep 17 00:00:00 2001
From: Jari Bakken <jari.bakken@gmail.com>
Date: Mon, 16 Apr 2018 10:02:43 +0200
Subject: [PATCH] Avoid redundant deep cloning when unwinding.

---
 lib/JSON2CSVBase.js | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/JSON2CSVBase.js b/lib/JSON2CSVBase.js
index 8d016702..b7d7d05e 100644
--- a/lib/JSON2CSVBase.js
+++ b/lib/JSON2CSVBase.js
@@ -234,8 +234,12 @@ class JSON2CSVBase {
    */
   unwindData(dataRow, unwindPaths) {
     return unwindPaths
-      .reduce((data, unwindPath) =>
-        data.map((dataEl) => {
+      .reduce((data, unwindPath) => {
+        function clone(o) {
+          return unwindPath.indexOf('.') !== -1 ? lodashCloneDeep(o) : Object.assign({}, o);
+        }
+
+        return data.map((dataEl) => {
           const unwindArray = lodashGet(dataEl, unwindPath);
 
           if (!Array.isArray(unwindArray)) {
@@ -244,7 +248,7 @@ class JSON2CSVBase {
 
           if (unwindArray.length) {
             return unwindArray.map((unwindEl, index) => {
-              const dataCopy = lodashCloneDeep(dataEl);
+              const dataCopy = clone(dataEl);
 
               if (this.opts.unwindBlank && index > 0) {
                 Object.keys(dataCopy).forEach(key => {
@@ -254,16 +258,16 @@ class JSON2CSVBase {
                 })
               }
 
-
               lodashSet(dataCopy, unwindPath, unwindEl);
               return dataCopy;
             });
           }
 
-          const dataCopy = lodashCloneDeep(dataEl);
+          const dataCopy = clone(dataEl);
           lodashSet(dataCopy, unwindPath, undefined);
           return dataCopy;
-        }).reduce((tempData, rows) => tempData.concat(rows), []),
+        }).reduce((tempData, rows) => tempData.concat(rows), [])
+      },
       [dataRow]
     )
     .reduce((tempData, rows) => tempData.concat(rows), []);