JS Practice — Built-in Objects

Reflect.deleteProperty() — nonexistent key

📖 Usage Example

const obj = { a: 1, b: 2 }
Reflect.deleteProperty(obj, 'a')
console.log(obj)              // → { b: 2 }
console.log('a' in obj)       // → false

Reflect.deleteProperty() deletes a property from an object, returning true on success, just like the delete operator.

Reflect.deleteProperty() — missing key

Deleting a nonexistent key is not an error — it just returns true.

Challenge: Verify that Reflect.deleteProperty({}, 'nonexistent') returns true.

💡 Hints (1)