JS Practice — Built-in Objects

Object.keys() — non-enumerable properties

📖 Usage Example

// Get array of own enumerable property names
const obj = { a: 1, b: 2, c: 3 }
Object.keys(obj)   // → ['a', 'b', 'c']

Use Object.keys() to get an array of an object's own enumerable property names for iteration or counting.

Object.keys() — enumerable only

Properties defined with Object.defineProperty and enumerable: false are excluded from Object.keys() results.

Challenge: Understand how enumerability affects Object.keys().

💡 Hints (1)