Question

var name = 'Mike';
var person = {
  name: 'John',
  welcome: function(){
    var name = 'Mary';
    return 'Hi ' + this.name;
  }
}

//person.welcome(); 
// output is
// Hi John
// I was expecting output to be
// Hi Mary

person.welcome.call();
// output is
// Hi Mike
// In this case since no argument is passed to call so this is window and 
// I get that window.name is Mike

Answer 1

var name = 'Mike';
var person = {
  name: 'John',
  welcome: function(){
    var name = 'Mary';
    return 'Hi ' + this.name;
  }
}

this.name refers to the object property “name”

name refers to the variable “name”

You would get the expected result with return 'Hi ' + name;