JS Practice — Built-in Objects

Object.entries() — only own enumerable properties

📖 Usage Example

// Get [key, value] pairs of an object
const obj = { a: 1, b: 2 }
Object.entries(obj)   // → [['a', 1], ['b', 2]]

Use Object.entries() to get an array of [key, value] pairs for iterating over an object's own enumerable properties.

Object.entries() — own properties only

Object.entries only returns own and enumerable properties — inherited or non-enumerable ones are excluded.

Challenge: Implement countEntries(obj) that returns the number of own enumerable entries.

countEntries({ a: 1, b: 2 }) // → 2

💡 Hints (2)