JS Practice — Built-in Objects

String.prototype.toLowerCase() — empty string

📖 Usage Example

'HELLO World'.toLowerCase()   // → 'hello world'
'ABC'.toLowerCase()           // → 'abc'
'XYZ123'.toLowerCase()        // → 'xyz123'

Use toLowerCase() to convert all alphabetical characters in a string to lowercase.

String.prototype.toLowerCase() — Empty String

Calling toLowerCase() on an empty string returns an empty string.

Challenge: Implement safeLower(str) using toLowerCase.

safeLower('') // → ''
safeLower('HI') // → 'hi'

💡 Hints (1)