JS Practice — Built-in Objects

Reflect.has() — check second key

📖 Usage Example

const obj = { a: 1 }
console.log(Reflect.has(obj, 'a'))  // → true
console.log(Reflect.has(obj, 'b'))  // → false
// Equivalent to: 'a' in obj

Reflect.has() checks whether an object has a property, equivalent to the in operator.

Reflect.has() — multiple keys

Reflect.has() can check for any key in an object.

Challenge: Verify that Reflect.has({a: 1, b: 2}, 'b') returns true.

💡 Hints (1)