Add linked_list.

Author: trekhleb

.babelrc

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    [
+      "env", {
+        "targets": {
+          "node": "current"
+        }
+      }
+    ]
+  ]
+}

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 2

.gitignore

@@ -1 +1,3 @@
+node_modules
+build
 .idea

README.md

@@ -1 +1,5 @@
 # Data Structures
+
+```
+npm run babel-node --silent ./src/linked_list
+```

package-lock.json

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+{
+  "name": "data-structures",
+  "version": "1.0.0",
+  "description": "Data structures on JavaScript",
+  "main": "index.js",
+  "scripts": {
+    "build": "babel src -d build",
+    "babel-node": "babel-node"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/trekhleb/data-structures.git"
+  },
+  "keywords": [],
+  "author": "Oleksii Trekhleb (https://www.linkedin.com/in/trekhleb/)",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/trekhleb/data-structures/issues"
+  },
+  "homepage": "https://github.com/trekhleb/data-structures#readme",
+  "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-preset-env": "^1.6.1"
+  }
+}

package.json

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+import { Node } from './Node';
+
+export class LinkedList {
+  constructor() {
+    this.head = null;
+  }
+
+  append(value) {
+    const newNode = new Node(value);
+
+    // If there is no head yet let's make new node a head.
+    if (!this.head) {
+      this.head = newNode;
+
+      return newNode;
+    }
+
+    // Rewind to last node.
+    let currentNode = this.head;
+    while (currentNode.nextNode !== null) {
+      currentNode = currentNode.nextNode;
+    }
+
+    // Attach new node to the end of linked list.
+    currentNode.nextNode = newNode;
+
+    return newNode;
+  }
+
+  prepend(value) {
+    this.head = new Node(value, this.head);
+  }
+
+  deleteWithValue(value) {
+
+  }
+
+  render() {
+    let currentNode = this.head;
+    let index = 0;
+
+    while(currentNode.nextNode !== null) {
+      console.log(`Node #${index} data: ${currentNode.value}`);
+      currentNode = currentNode.nextNode;
+      index++;
+    }
+
+    // Print the tail.
+    console.log(`Node #${index} data: ${currentNode.value}`);
+  }
+}

src/linked_list/LinkedList.js

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+export class Node {
+  constructor(value, nextNode = null) {
+    this.value = value;
+    this.nextNode = nextNode;
+  }
+}

src/linked_list/Node.js

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+import { LinkedList } from "./LinkedList";
+
+const linkedList = new LinkedList();
+
+linkedList.append(1);
+linkedList.append(2);
+linkedList.append(3);
+linkedList.prepend(4);
+linkedList.prepend(5);
+
+linkedList.render();