interview questions js[ Anurag Singh ProCodrr]

 javascript object:-A JavaScript object is a collection of named values.

JavaScript objects are containers for named values, called properties and methods.

There are different ways to create new objects:

• Create a single object, using an object literal.
• Create a single object, with the keyword new.
• Define an object constructor, and then create objects of the constructed type.
• Create an object using Object.create()

https://www.javascripttutorial.net/javascript-array-filter/

https://www.javascripttutorial.net/javascript-closure/

1....

const person = {
  firstName: "John",
  lastName: "Doe",
  age: 50,
  eyeColor: "blue"
};

2..

const person = {};
person.firstName = "John";
person.lastName = "Doe";
person.age = 50;
person.eyeColor = "blue";

3....

const person = new Object();
person.firstName = "John";
person.lastName = "Doe";
person.age = 50;
person.eyeColor = "blue";

4.....

const user={

    first_name:"raj",

    last_name:"joshi",

    fullname:function(){

      return  this.first_name+""+this.last_name;

    }

}

user.address="delhi";

for (let  key in user){

    console.log(user[key]);

             

}

delete user.last_name;

for (let  key in user){

    console.log(user[key]);

             

}

console.log(user.first_name.toUpperCase());

let copiedPerson = JSON.parse(JSON.stringify(person));