JS Practice — Built-in Objects

String.prototype.includes() — with position parameter

📖 Usage Example

const str = 'Hello, World!'
str.includes('World')    // → true
str.includes('xyz')      // → false
str.includes('Hello', 1) // → false

Use includes() to check if a string contains a specific substring, with an optional start position.

String.prototype.includes() — Start Position

The optional second argument position sets where the search starts.

'hello hello'.includes('hello', 1) // → true (found at index 6)
'hello hello'.includes('hello', 7) // → false

Challenge: Implement includesAfter(str, sub, pos).

💡 Hints (1)