JS Practice — Built-in Objects

String.prototype.includes() — substring found

📖 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()

str.includes(searchString) returns true if the string contains the given substring.

Challenge: Implement containsHello(str) that checks if 'hello' is in str.

containsHello('say hello world') // → true
containsHello('goodbye world')   // → false

💡 Hints (1)