Need to make function toJson(). USING JAVASCRIPT

This method should return a JSON representation of the object this method is being applied to.

Also check if containsProperty("z") = true

const obj3 = { a: 1, b: 2, c: [ 1, 2, 3, 4 ], d: { X: 1, y: 2, z: 3, }; console.log(obj3.toJson()); // {"a":1,"b":2,"C":[1,2,3,4], "d":{"x":1,"y":2,"z":3}} console.log(obj3.containsProperty('z')); // true