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Commit fd11deb

Browse files
Additional inbuilt object methods
1 parent ad5fb04 commit fd11deb

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3 files changed

+158
-10
lines changed

3 files changed

+158
-10
lines changed

‎8_Objects_in_detail/object.js‎

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

‎8_Objects_in_detail/objects.md‎

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@@ -64,3 +64,76 @@ const car = {
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car.Details(); // Lambo 2019
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```
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#### Methods
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```js
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// Object.keys() creates an array containg the keys of an object.
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// Intialize an object
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const employee = {
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boss: "Shubham",
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secretary: "Samarth",
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sales: "John",
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accountant: "Oscar",
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};
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// Let's say we want to see all the positions(keys) in the employee object
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const positions = Object.keys(employee);
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console.log(positions); // [ 'boss', 'secretary', 'sales', 'accountant' ]
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// Object.values() creates an array containg the values of an object.
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const session = {
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id: 1,
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time: `26-July-2022`,
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device: "Mobile",
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browser: "Chrome",
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};
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const sessionInfo = Object.values(session);
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console.log(sessionInfo); // [ 1, '26-July-2022', 'Mobile', 'Chrome' ]
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// Object.entries() creates an array containg the key/value of an object.
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const operatingSystem = {
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name: "Ubuntu",
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version: "20.04",
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license: "Open Source",
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};
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const entries = Object.entries(operatingSystem);
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console.log(entries); // [
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[ 'name', 'Ubuntu' ],
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[ 'version', '20.04' ],
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[ 'license', 'Open Source' ]
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]
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// Intialize an object
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const user = {
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username: "Shubham",
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password: "12345",
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};
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const admin = Object.freeze(user);
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user.username = "Samarth"; // Trying to overwrite the object username
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console.log(user.username); // Shubham (remains the same);
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// Object.seal() prevents new properties
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// from being added to an object,
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// but allows the modification of existing properties
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// Intialize an object
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const user = {
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username: "Shubham",
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password: "12345",
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};
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const newUser = Object.seal(user);
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newUser.username = "Samarth"; // The username will be changed
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newUser.age = 23; // the age property will not be added because we applied Object.seal()
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console.log(user);// { username: 'Samarth', password: '12345' }
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```
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‎8_Objects_in_detail/objects2.js‎

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