Additional inbuilt object methods

Author: ShubhamSKadam

8_Objects_in_detail/object.js

@@ -15,19 +15,93 @@
 // console.log(person);
 
 // Dot notation
-const person = {
-    firstName: "Shubham",
+// const person = {
+//     firstName: "Shubham",
+// };
+
+// person.dog = {
+//     name: "fluffy",
+//     age: 2,
+// };
+
+// person.age = 23;
+// console.log(person.dog.age);
+
+// Square bracket notation
+// const property = "age";
+
+// console.log(person[property]);
+
+// Object.keys() creates an array containg the keys of an object.
+
+// Intialize an object
+const employee = {
+    boss: "Shubham",
+    secretary: "Samarth",
+    sales: "John",
+    accountant: "Oscar",
 };
 
-person.dog = {
-    name: "fluffy",
-    age: 2,
+// Let's say we want to see all the positions(keys) in the employee object
+const positions = Object.keys(employee);
+console.log(positions);
+
+// Object.values() creates an array containg the values of an object.
+const session = {
+    id: 1,
+    time: `26-July-2022`,
+    device: "Mobile",
+    browser: "Chrome",
 };
 
-person.age = 23;
-console.log(person.dog.age);
+const sessionInfo = Object.values(session);
+console.log(sessionInfo);
 
-// Square bracket notation
-const property = "age";
+// Object.entries() creates an array containg the key/value of an object.
+const operatingSystem = {
+    name: "Ubuntu",
+    version: "20.04",
+    license: "Open Source",
+};
+
+const entries = Object.entries(operatingSystem);
+
+entries.forEach((entry) => {
+    let key = entry[0];
+    let value = entry[1];
+
+    console.log(`${key}:${value}`);
+});
+
+// Object.freeze() prevents modification to
+// properties and values of an object,
+// and prevents properties from being
+// added or removed from an object
+
+// Intialize an object
+// const user = {
+//     username: "Shubham",
+//     password: "12345",
+// };
+
+// const admin = Object.freeze(user);
+
+// user.username = "Samarth"; // Trying to overwrite the object username
+// console.log(user.username); // Shubham (remains the same);
+
+// Object.seal() prevents new properties
+// from being added to an object,
+// but allows the modification of existing properties
+// Intialize an object
+
+const user = {
+    username: "Shubham",
+    password: "12345",
+};
+
+const newUser = Object.seal(user);
+
+newUser.username = "Samarth"; // The username will be changed
+newUser.age = 23; // the age property will not be added because we applied Object.seal()
 
-console.log(person[property]);
+console.log(user);

8_Objects_in_detail/objects.md

@@ -64,3 +64,76 @@ const car = {
 car.Details(); // Lambo 2019
 ```
 
+#### Methods 
+
+```js
+// Object.keys() creates an array containg the keys of an object.
+
+// Intialize an object
+const employee = {
+    boss: "Shubham",
+    secretary: "Samarth",
+    sales: "John",
+    accountant: "Oscar",
+};
+
+// Let's say we want to see all the positions(keys) in the employee object
+const positions = Object.keys(employee);
+console.log(positions); // [ 'boss', 'secretary', 'sales', 'accountant' ]
+
+// Object.values() creates an array containg the values of an object.
+const session = {
+    id: 1,
+    time: `26-July-2022`,
+    device: "Mobile",
+    browser: "Chrome",
+};
+
+const sessionInfo = Object.values(session);
+console.log(sessionInfo); // [ 1, '26-July-2022', 'Mobile', 'Chrome' ]
+
+// Object.entries() creates an array containg the key/value of an object.
+const operatingSystem = {
+    name: "Ubuntu",
+    version: "20.04",
+    license: "Open Source",
+};
+
+const entries = Object.entries(operatingSystem);
+
+console.log(entries); // [
+  [ 'name', 'Ubuntu' ],
+  [ 'version', '20.04' ],
+  [ 'license', 'Open Source' ]
+]
+
+// Intialize an object
+const user = {
+    username: "Shubham",
+    password: "12345",
+};
+
+const admin = Object.freeze(user);
+
+user.username = "Samarth"; // Trying to overwrite the object username
+console.log(user.username); // Shubham (remains the same);
+
+// Object.seal() prevents new properties
+// from being added to an object,
+// but allows the modification of existing properties
+// Intialize an object
+
+const user = {
+    username: "Shubham",
+    password: "12345",
+};
+
+const newUser = Object.seal(user);
+
+newUser.username = "Samarth"; // The username will be changed
+newUser.age = 23; // the age property will not be added because we applied Object.seal()
+
+console.log(user);// { username: 'Samarth', password: '12345' }
+
+```
+

8_Objects_in_detail/objects2.js

@@ -17,3 +17,4 @@ const car = {
 };
 
 car.Details(); // Lambo 2019
+