fixed logic in setValue for existing null values

Author: lingwooc

.vscode/launch.json

@@ -0,0 +1,21 @@
+{
+	// Use IntelliSense to learn about possible Node.js debug attributes.
+	// Hover to view descriptions of existing attributes.
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "node",
+			"request": "launch",
+			"name": "Launch Program",
+			"program": "${workspaceRoot}\\test\\complexTemplate.js",
+			"cwd": "${workspaceRoot}"
+		},
+		{
+			"type": "node",
+			"request": "attach",
+			"name": "Attach to Process",
+			"port": 5858
+		}
+	]
+}

index.js

@@ -47,24 +47,21 @@ exports.DataTransform = function(data, map){
 				return;
 			}
 
-			var value = obj || data,
-				key = key || map.list,
-				keys = null;
 			if(key == "") {
 				return;
 			} 
-
+			
 			keys = key.split('.');
-			let target = null;
+			var target = obj;
 			for(var i = 0; i < keys.length; i++ ) {
-				if(value !== "undefined" && value[keys[i]]) {
-					target = value;
-					value = value[keys[i]];
-				} else{
+				if(i == keys.length-1){
+					target[keys[i]] = newValue;
 					return;
 				}
+				if(keys[i] in target)
+					target = target[keys[i]];
+				else return;
 			}
-			target[keys[i-1]] = newValue;
 		},
 
 		getList: function(){

test/complexTemplate.js

@@ -7,6 +7,7 @@ let map = {
 		id: 'id',
 		sku: 'sku',
 		toReplace: 'sku',
+		errorReplace: 'notFound',
 		simpleArray: ['id', 'sku','sku'],
 		complexArray: [{node: 'id'},{otherNode:'sku'},{toReplace:'sku'}],
 		subObject: {
@@ -22,6 +23,10 @@ let map = {
 		run: (val)=>'replacement',
 		on: 'subObject.subSubObject.node1'
 	},
+	{
+		run: (val)=>'replacement',
+		on: 'errorReplace'
+	},
 	{
 		run: (val)=>'replacement',
 		on: 'toReplace'