JS Practice — Built-in Objects

String.prototype.valueOf() — in arithmetic context

📖 Usage Example

const str = 'Hello'
str.valueOf()               // → 'Hello'
new String('hi').valueOf()   // → 'hi'

Use valueOf() to return the primitive string value, useful when working with String wrapper objects.

String.prototype.valueOf() — Arithmetic

JavaScript calls valueOf() implicitly when an object is used in an arithmetic expression.

Challenge: Implement strLength(str) that returns the number of characters using valueOf().

strLength('hello') // → 5

💡 Hints (1)

• `str.valueOf()` returns the string itself, so `.valueOf().length` is the same as `.length`.