notes.txt

OOPS: Object Oriented Programming
//javascript has inherited some features from java
//main pillar of java 
//encapsulation , inheritance , polymorphism
------------------------
//encapsulation:hiding the implementation details.In which one thing is included with 
other thing so that inclusive things will not appear.
example: whatsapp
---------------------
//inheritance: a parent-child relationship, in which the class takes all the 
characteristics of parent class.(child==>inherits==>parents)
example: genes/dna 
-----------
//polymorphism: a way to achieve a single action in different ways.
example: myself
------------
//classes and objects
//methods
//accessing
------------------------
class: it is a collection of properties , methods and objects.
. classes are generally defined by using the class keyword.
syntax: 
class Classname{          
        //properties
        //methods
        //objects
}
example: 
class Movie{
//rating , review , actor , actress, director , music director , genre
}

-----------------------
Object:Object is called as the real time entity.(touch and feel)
.objects are specific to the class
syntax:
var objectname = new Classname();
new - new is a keyword used to create instance of an object.
-----------------------
constructor: to store value inside the objects.
this: it is the temporary keyword which is pointing to the freshly created objects.
------------------------------
example: car 
class Car{
    constructor(brand ,color){
        this.brand = brand; // key = value
        this.color = color; 
    }
    printcolor(){
    return this.color;
}
}
var test = new Car("Audi", "black");
console.log(`the color of my car is ${test.color}`);
----------------------------------------
//task : 
class ==> person 
properties = (name , age , salary , gender)
-----------------------------------
methods: functions
printcolor(){
    return this.color;
}
example:
class Car {
  constructor(brand, color) {
    this.brand = brand; // key = value
    this.color = color;
  }
  printcolor(str) {
    return str + this.color;
  }
}
var test = new Car("Audi", "black");
var result = test.printcolor("the color of my car is ");
console.log(result);
-----------------------------------------------

Arrow:
 var sum = (a,b)=>a*b
 console.log(sum(2,3))
 ------------------------------------------------------
 //normal function
 function sum (a,b) {
    return a*b
 }
 console.log(sum(2,3))
 ---------------------------------------------------
 //annonumous function
 var sum= function (a,b) {
    return a*b
 }
 console.log(sum(2,3))
 -------------------------------------------------
 //IIFE:-()()
 (function(){
    console.log("this is IIFE")
 })()
 ------------------------------------------
 //with parameter
 (function(name){
    console.log(name);
 })("Rupan")
---------------------------------------
//IIFE:- with return :
  (function(name){
    return name
 })("Rupan")
 --------------------------------------
 arrow with return:-
let sum =(a,b)=>{
    var result = 100;
    var total = result+a+b
    return total
 }
 console.log(sum(100,50))
 console.log(sum(56,200))
 --------------------------------------------------------