use of static keyword

tanishqaarora · tanishqaarora · commit 28dafa7db05e · 2023-03-20T16:06:30.000+05:30
diff --git a/class.js b/class.js
@@ -11,7 +11,7 @@ class Book {
 
     getAge(){
         const years = new Date().getFullYear() - this.year;
-        return `${this.title} is ${years} old`;
+        return `${this.title} is ${years} years old`;
     }
     
     revise(newYear) {
@@ -24,8 +24,8 @@ class Book {
 
 const book1 = new Book('Book One', 'John Doe', '2013');
 console.log(book1);
-book1.revise('2018');
-console.log(book1);
-
+// book1.revise('2018');
+// console.log(book1);
+console.log(book1.getAge());
 
 
diff --git a/index.html b/index.html
@@ -8,6 +8,6 @@
 </head>
 <body>
     <h2>JavaScript OOP</h2>
-    <script src="./SubClass.js"></script>
+    <script src="./staticInClass.js"></script>
 </body>
 </html>
diff --git a/staticInClass.js b/staticInClass.js
@@ -0,0 +1,31 @@
+
+class Book {
+
+    static newBooks = true;
+    static oldBooks = true;
+
+    constructor(title, author, year) {
+        this.title = title;
+        this.author = author;
+        this.year = year;
+    }
+
+    getSummary(){
+        return `${this.title} was written by ${this.author} in year ${this.year}`;
+    }
+
+    getAge(){
+        const years = new Date().getFullYear() - this.year;
+        return `${this.title} is ${years} old`;
+    }
+
+}
+
+const book1 = new Book('Book One', 'John Doe', '2013');
+
+// instance of Book do not contain static methods
+console.log(book1);
+
+// static methods can only be accessed by the class
+console.log(Book.newBooks);
+console.log(Book.oldBooks);
