JS Practice — Built-in Objects

Object.keys() — inherited properties excluded

📖 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() — own properties only

Unlike for...in, Object.keys() does not include inherited properties from the prototype chain.

Challenge: Use Object.keys() to get only the own keys of an object that inherits from another.

💡 Hints (1)