add eslint, follow airbnb style

Author: dingjy94

.eslintrc.json

@@ -0,0 +1,24 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": ["plugin:jest/recommended", "airbnb"],
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018,
+        "sourceType": "module"
+    },
+    "plugins": ["jest"],
+    "rules": {
+        "jest/no-disabled-tests": "warn",
+        "jest/no-focused-tests": "error",
+        "jest/no-identical-title": "error",
+        "jest/prefer-to-have-length": "warn",
+        "jest/valid-expect": "error"
+    }
+}

dataStructure/queue/queue.js

@@ -1,12 +1,12 @@
 class Node {
-  constructor (val, next = null) {
+  constructor(val, next = null) {
     this.val = val;
     this.next = next;
   }
 }
 
 export default class Queue {
-  constructor () {
+  constructor() {
     this.head = null;
     this.tail = null;
   }

dataStructure/queue/queue.test.js

@@ -1,4 +1,4 @@
-import Queue from "./queue";
+import Queue from './queue';
 
 describe('Queue', () => {
   const queue = new Queue();
@@ -25,5 +25,5 @@ describe('Queue', () => {
   it('should remove 2, and queue is empty', () => {
     expect(queue.remove()).toBe(2);
     expect(queue.isEmpty()).toBeTruthy();
-  })
+  });
 });

dataStructure/stack/stack.js

@@ -1,12 +1,12 @@
 class Node {
-  constructor (val, next = null) {
+  constructor(val, next = null) {
     this.val = val;
     this.next = next;
   }
 }
 
 export default class Stack {
-  constructor () {
+  constructor() {
     this.top = null;
   }
 

dataStructure/stack/stack.test.js

@@ -1,4 +1,4 @@
-import Stack from "./stack";
+import Stack from './stack';
 
 describe('Stack', () => {
   const stack = new Stack();
@@ -25,6 +25,5 @@ describe('Stack', () => {
   it('should pop 1, and stack is empty', () => {
     expect(stack.pop()).toBe(1);
     expect(stack.isEmpty()).toBeTruthy();
-  })
+  });
 });
-