thisinjs.js

function Product(title,price){
  this.title = title; 
  this.price = price; 
  console.log(this); 
}


// call a function as method   - MIP   
// value of this inside function - always object before dot

// var Foo = {
//    name :"DJ",
//   Product:function(title,price){
//     console.log(this);
//   }
// }

// var Koo = {
//   title:'koo',
//   age : 9
// }

// Foo.Product();


// // call a function as function - FIP 
// // value of this inside function - global object 
// var p1 = Product("Pen",20);
// console.log(p1);

// // call a function as constructor  - CIP  
// // value of this inside function - always newly created object 
// // [[Construct]]
// var p1 =  new Product("Pen",20);
// console.log(p1);


function sendEmail(message,to){
  this.message = message; 
  this.to = to; 
  console.log(this); 
}

var Manger = {
  name :'foo',
  sal : 489494
}; 

var Employee = {
  name :'koo',
  managername :'foo',
  sale : 3477
}

// IIP , you can pass value of this manually 
// ABC
// apply - array 
// bind - new object 
// call - commas 
sendEmail.apply(Manger,["Hello how are you",'debugmode@outlook.com']);
sendEmail.call(Employee,"Hello emp how are you",'hello@geek97.com');


var Product = (title,price)=>{

}

// arrow function does not have its own valuwe of 'this'
// arrow function can not be used with new . means you can not use it CIP because it does not have 
// [[Construct]]
// arrow functioon does not have arguments object