instanceof

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}
const auto = new Car("Honda", "Accord", 1998);

console.log(auto instanceof Car);
// Expected output: true

console.log(auto instanceof Object);
// Expected output: true

//  
function C() {}
function D() {}

var o = new C();

// true,  : Object.getPrototypeOf(o) === C.prototype
o instanceof C;

// false,   D.prototype      o
o instanceof D;

o instanceof Object; // true,  :
C.prototype instanceof Object; // true

C.prototype = {};
var o2 = new C();

o2 instanceof C; // true

// false,   C.prototype     o
o instanceof C;

D.prototype = new C(); // add C to [[Prototype]] linkage of D
var o3 = new D();
o3 instanceof D; // true
o3 instanceof C; // true,   C.prototype      o3

var simpleStr = "  ";
var myString = new String();
var newStr = new String(",    ");
var myDate = new Date();
var myObj = {};

simpleStr instanceof String; //  false,   
myString instanceof String; //  true
newStr instanceof String; //  true
myString instanceof Object; //  true

myObj instanceof Object; //  true,   ,  undefined
({}) instanceof Object; //  true,   

myString instanceof Date; //  false

myDate instanceof Date; //  true
myDate instanceof Object; //  true
myDate instanceof String; //  false

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}
var mycar = new Car("Honda", "Accord", 1998);
var a = mycar instanceof Car; //  true
var b = mycar instanceof Object; //  true