From 0ea24230d4fa77bd7666bc871f1c7682a7b62795 Mon Sep 17 00:00:00 2001
From: Simon <34153549+seIncorp@users.noreply.github.com>
Date: Mon, 6 Aug 2018 15:02:46 +0200
Subject: [PATCH] Patch 5 (#127)

* New function 'fromArray'

Function get array of Doubly Linked List Nodes, go through and append to currently list.

* New Test for new function 'fromArray'

* Minor changes

Minor changes about coding style.
---
 .../doubly-linked-list/DoublyLinkedList.js      |  9 +++++++++
 .../__test__/DoublyLinkedList.test.js           | 17 +++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/src/data-structures/doubly-linked-list/DoublyLinkedList.js b/src/data-structures/doubly-linked-list/DoublyLinkedList.js
index 25fb0508..6b7f908e 100644
--- a/src/data-structures/doubly-linked-list/DoublyLinkedList.js
+++ b/src/data-structures/doubly-linked-list/DoublyLinkedList.js
@@ -213,6 +213,15 @@ export default class DoublyLinkedList {
     return nodes;
   }
 
+  /**
+   * @param {DoublyLinkedListNode[]} array - Array of nodes
+   * @return {DoublyLinkedListNode[]}
+   */
+  fromArray(arr = []) {
+    arr.forEach(node => this.append(node.value));
+    return this;
+  }
+
   /**
    * @param {function} [callback]
    * @return {string}
diff --git a/src/data-structures/doubly-linked-list/__test__/DoublyLinkedList.test.js b/src/data-structures/doubly-linked-list/__test__/DoublyLinkedList.test.js
index 4490574e..d036e3f5 100644
--- a/src/data-structures/doubly-linked-list/__test__/DoublyLinkedList.test.js
+++ b/src/data-structures/doubly-linked-list/__test__/DoublyLinkedList.test.js
@@ -36,6 +36,23 @@ describe('DoublyLinkedList', () => {
     expect(linkedList.toString()).toBe('3,2,1');
   });
 
+  it('should append new nodes from array', () => {
+    const linkedList1 = new DoublyLinkedList();
+    linkedList1.append(1);
+    linkedList1.append(1);
+    linkedList1.append(2);
+    linkedList1.append(3);
+    linkedList1.append(3);
+    linkedList1.append(3);
+    linkedList1.append(4);
+    linkedList1.append(5);
+    const array = linkedList1.toArray();
+
+    const linkedList2 = new DoublyLinkedList();
+    linkedList2.fromArray(array);
+    expect(linkedList2.toString()).toBe('1,1,2,3,3,3,4,5');
+  });
+
   it('should delete node by value from linked list', () => {
     const linkedList = new DoublyLinkedList();