Object.prototype.hasOwnProperty.call

has-own-property.js

const myObject = Object.create(null);

myObject; // {}
myObject.test; // undefined
Object.prototype.hasOwnProperty.call(myObject, 'test'); // false

// Uncaught TypeError:
// myObject.hasOwnProperty is not a function
myObject.hasOwnProperty('test');

myObject.test = true;

myObject; // { test: true }
myObject.test; // true
Object.prototype.hasOwnProperty.call(myObject, 'test'); // true

// Uncaught TypeError:
// myObject.hasOwnProperty is not a function
myObject.hasOwnProperty('test');