JS Practice — Built-in Objects

Reflect.deleteProperty() — key no longer in object

📖 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() — key removal

After deletion, the key is gone from the object — 'a' in o returns false.

Challenge: Verify that after Reflect.deleteProperty(o, 'a'), 'a' in o is false.

💡 Hints (1)