What is the output of the following code? “`js const obj = {x: 1}; Object.defineProperty(obj, ‘y’, { value: 2, writable: false, enumerable: false }); console.log(Object.keys(obj)); “`

Question

JavaScript Developer — Hard

What is the output of the following code? “`js const obj = {x: 1}; Object.defineProperty(obj, ‘y’, { value: 2, writable: false, enumerable: false }); console.log(Object.keys(obj)); “`

Accepted Answer

The output of the code will be ['x'] because the `Object.keys()` method only returns the enumerable properties of an object. In this case, the property 'y' is not enumerable due to the `enumerable: false` option in `Object.defineProperty()`.