Objects in Javascript

Object is one of the most important datatype in javascript(as Js is an object oriented programming).It is a non-primitive datatype.

object has properties and behaviour. property are variables that describe the object and behavior are methods that perform some activity or tasks

for example : consider object called student

const Student = {
name: "xyz",
roll: 123,
age: **,

  marks: function(sub1,sub2,sub3){
   return sub1+sub2+sub3;
   }

};

In this syntax,
name,roll,age are properties of student and marks is a function that
calculate the total marks the student acquired in exams.

To print the properties,
console.log(Student.name);
output: xyz.

Student is the object and name is the key through which value is picked and printed in console log

To run the function,
console.log(Student.marks(80,70,90));
output: 240.

in here marks is the key through which the function is called.

Nested object:

which means object inside an object, this is possible as object property may contain one or more nested object inside it to describe its properties and functionality

Example:

const Yamaha = {
founded : 1887,
origin : "Japan",
products : {
bikes : {
name : "XSR",
cc : 155,
fuel : "petrol"
},
pianos:{
name :"ARIUS",
variant: "YDP-165"
}
},
driving: function(){
console.log("driving a vehicle of yamaha");
}
};

In this Yamaha object following are nested objects

1. bikes
2. pianos

way to get the values of nested objects
console.log(Yamaha.founded); output = 1887
console.log(Yamaha.products.bikes.name); output = XSR
console.log(Yamaha.products.pianos.variant); output = YDP-165

(TBD) this keyword in object and Object Constructor Functions

referrence:https://www.w3schools.com/js/js_objects.asp