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JS Object Methods

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Method

Description

Example

Add and delete

Modifying Object Properties

 
let person = {
    name: "John",
};
person.age = 30 // {name:"John",age:30}
delete person.name // {age:30}

Object.keys()

Get all keys in the object.

 
let person = {
    name: "John",
    age : 30
};
Object.keys(person) // ["name", "age"]

Object.values()

Get all values in the object.

 
let person = {
    name: "John",
    age : 30
};
Object.values(person) // ["John", 30]

Object.entries()

Get key-value pairs as an array.

 
let person = {
    name: "John",
    age : 30
};
Object.entries(person) // [["name", "John"], ["age", 31]]

Object.assign()

Copy properties from one object to another.

 
let person = {
    name: "John",
    age : 30
};
const additionalInfo = { profession: "Engineer" };
const updatedPerson = Object.assign(person, additionalInfo);
// {name: "John",age : 30,profession: "Engineer"};

Object.freeze()

Prevents modifications (add, delete, or update)

 
let person = {
    name: "John",
};
Object.freeze(person);
person.age = 30 // error will through

Object.seal()

Prevents adding or deleting, but allows updating existing properties.

 
let person = {
    name: "John",
};
Object.seal(person);
person.name = "Doe" // {name : "Doe"}
person.age = 30 // error will through
delete person.name // error will through

Add and delete Object:

Modifying Object Properties

Example
let person = {
name: "John",
};
person.age = 30 // {name:"John",age:30}
delete person.name // {age:30}

Try it yourself

Object.keys():

Get all keys in the object.

Example
let person = {
name: "John",
age : 30
};
Object.keys(person) // ["name", "age"]

Try it yourself

Object.values():

Get all values in the object.

Example
let person = {
name: "John",
age : 30
};
Object.values(person) // ["John", 30]

Try it yourself

Object.entries():

Get key-value pairs as an array.

Example
let person = {
name: "John",
age : 30
};
Object.entries(person) // [["name", "John"], ["age", 31]]

Try it yourself

Object.assign():

Copy properties from one object to another.

Example
let person = {
name: "John",
age : 30
};
const additionalInfo = { profession: "Engineer" };
const updatedPerson = Object.assign(person, additionalInfo);
// {name: "John",age : 30,profession: "Engineer"};

Try it yourself

Object.freeze():

Prevents modifications (add, delete, or update)

Example
let person = {
name: "John",
};
Object.freeze(person);
person.age = 30 // error will through

Try it yourself

Object.seal():

Prevents adding or deleting, but allows updating existing properties.

Example
let person = {
name: "John",
};
Object.seal(person);
person.name = "Doe" // {name : "Doe"}
person.age = 30 // error will through
delete person.name // error will through

Try it yourself

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