		'use strict';
		var isArray = require('isarray');
		var extend = require('extend');
		var exists = require('property-exists');
		var isArray = require('lodash.isarray');
		var assign = require('lodash.assign');

		@@ -13,3 +12,3 @@ var createTree = function(array, rootNodes, customID) {

		if (!node && !exists(rootNodes, rootNode)) {
		if (!node && !rootNodes.hasOwnProperty(rootNode)) {
		continue ;
		@@ -29,16 +28,13 @@ }
		var groupByParents = function(array, options) {
		var parents = {};

		array.forEach(function(item) {
		return array.reduce(function(prev, item) {
		var parentID = item[options.parentProperty] \|\| options.rootID;

		if (parentID && exists(parents, parentID)) {
		parents[parentID].push(item);
		return ;
		if (parentID && prev.hasOwnProperty(parentID)) {
		prev[parentID].push(item);
		return prev;
		}

		parents[parentID] = [item];
		});

		return parents;
		prev[parentID] = [item];
		return prev;
		}, {});
		};
		@@ -65,4 +61,3 @@
		module.exports = function arrayToTree(data, options) {
		data = data \|\| [];
		options = extend({
		options = assign({
		parentProperty: 'parent_id',
		@@ -69,0 +64,0 @@ customID: 'id',

package.json

		{
		"name": "array-to-tree",
		"version": "2.1.11",
		"version": "2.1.12",
		"description": "Convert a plain array of nodes (with pointers to parent nodes) to a tree",
		@@ -9,3 +9,3 @@ "main": "index.js",
		"tdd": "npm test -- --watch",
		"release": "npm version ${BUMP:-\"patch\"} --no-git-tag-version && git add package.json && git commit -m \":octocat: Bump to $(cat package.json \| jq -r .version)\" && git tag $(cat package.json \| jq -r .version) && git push && git push --tags && npm publish"
		"release": "npm version ${BUMP:-\"patch\"} --no-git-tag-version && git add package.json && git commit -m \":octocat: Bump to $(cat package.json \| json version)\" && git tag $(cat package.json \| json version) && git push && git push --tags && npm publish"
		},
		@@ -23,2 +23,3 @@ "repository": "alferov/array-to-tree",
		"devDependencies": {
		"json": "^9.0.3",
		"chai": "^3.2.0",
		@@ -37,6 +38,5 @@ "eslint": "^1.4.1",
		"dependencies": {
		"extend": "^3.0.0",
		"isarray": "0.0.1",
		"property-exists": "^1.0.1"
		"lodash.assign": "^4.0.6",
		"lodash.isarray": "^4.0.0"
		}
		}

test/test.js

		@@ -59,3 +59,3 @@ 'use strict';

		it('should return the same array if there is no pointer to parent', function() {
		it('returns the same array if there is no pointer to parent', function() {

		@@ -70,3 +70,3 @@ var modified = initial.map(function(item) {
		});
		})
		});

		@@ -73,0 +73,0 @@ describe('with different options', function() {

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