JS Practice — Built-in Objects

String.prototype.startsWith() — empty string always true

📖 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() — Empty String

Every string starts with an empty string '', so .startsWith('') always returns true.

Challenge: Implement alwaysTrue(str) that checks if str starts with ''.

alwaysTrue('anything') // → true
alwaysTrue('')         // → true

💡 Hints (1)

• The empty string `""` is a prefix of every string.