# Understanding Object Method In Javascript.

In JavaScript, an object is a **containers** for **named values** called **properties**. E.g. a generator. All generator have the same **properties**, but the property **values** differ from generator to generator. All generators have the same **method**, but the methods are performed **at different times** while a variable is an address or a location memory where you can store any value. E.g. a box in which you can store different items at different times. Object are variable too but object can contain many values. Eg.

Const generator = {type:’’Fireman’’, model: ‘’310'’; color: ‘’red’’};

The value are written as name:value pairs (name and value separated by a colon).

**4 Types of JavaScript method**

1\. **Object.Keys()** :- it create an array containing the keys of an object. E.g.

Const num = {

One : 1,

Two : 2,

Three: 3,

}

Console.log(object.keys(num)); / / \[‘one’, ‘two’, ‘three’ \]

2\. **Object.values()** :- it create an array containing the values of an object. E.g.

Const num = {

One : 1,

Two : 2,

Three: 3,

}

Console.log(object.keys(num)); / / \[1,2,3\]

3\. **Object.enteries()**:- it’s used to create a nested array of the key/value pairs of an object. Eg.

Const num = {

One : 1,

Two : 2,

Three: 3,

}

Console.log(object.entries(num));

/ / Expected output :

// \[ \[‘one’, 1\], \[‘two’, 2\], \[‘three’ 3\] \]

4\. **Object.Seal()**:- it **prevent new properties** from being **added** to an object, but **allows** the **modification** of existing properties.

Const user = {

Username: ‘something’,

Password: ‘vmfmbdsmckjrkm’

};

// seal the object

Const newuser = object.seal(user);

newUser.password = ‘\*\*\*\*\*\*\*\*\*\*\*\*’

newUser.active = true;

console.log(newUser);

\*/ Expected output

{username: ‘something’, password: ‘\*\*\*\*\*\*\*’}

Thanks for your time, kindle like and share to assist someone.

Author: Abel K. Kingsley.

Special thanks: PearlxTech Concept and CodeLab By Skill Hub.