JS Practice — Built-in Objects

Array.prototype.length — read the length

📖 Usage Example

const arr = [10, 20, 30]
arr.length  // → 3

Read the length property to get the number of elements in an array.

Array.prototype.length

Array.prototype.length is a property (not a method) that returns the number of elements in an array. It is always a non-negative integer and updates automatically as elements are added or removed.

Challenge: Implement getLength(arr) that returns the length of the array.

getLength([1, 2, 3]) // → 3
getLength([])        // → 0

💡 Hints (2)

• `arr.length` is a property — no parentheses needed.
• The length of an empty array is `0`.