let map = {one: true, two: true, hasOwnProperty: true};

// Fix this call
console.log(Object.prototype.hasOwnProperty.call(map, "one"));
// → true

let map = {one: true, two: true, hasOwnProperty: true};

console.log(Object.prototype.hasOwnProperty.call(map, "one"));

Add chapter 6, exercise 4
Add chapter 6, exercise 4
