JS Practice — Built-in Objects

String.prototype.startsWith() — case-sensitive

📖 Usage Example

const str = 'Hello, World!'
str.startsWith('Hello')         // → true
str.startsWith('World')         // → false
str.startsWith('World', 7)      // → true

Use startsWith() to check if a string begins with a specific prefix, with an optional start position.

String.prototype.startsWith() — Case Sensitivity

.startsWith() is case-sensitive. 'Hello' does not start with 'hello'.

Challenge: Implement startsWithExact(str, prefix) that checks the prefix case-sensitively.

startsWithExact('Hello', 'hello') // → false
startsWithExact('Hello', 'Hello') // → true

💡 Hints (1)

• `startsWith` performs a case-sensitive comparison.