//this keyword always refers to the calling site it means how a function is called
//Except arrow function & arrow function refer to lexical scope;
global.zahid="Mollik";
const ob={
  name:"Mollik",
  show:function(){

      console.log(this);//when show method call with ob then this keyword refer to that ob object
      function x(){
        console.log(this);//here this function call like a  normal function & we know in regular function this keyword refer to global object 
        console.log(this.zahid)//that's why we access zahid here
      };
      x();
      (()=>{
        console.log(this);// refer to lexical scope & it lexical scope is show method
        console.log(this.name)//In show method this keyword refer to ob object
      })();               
     
  }

}
console.log(ob.show());