JS Practice — Built-in Objects

String.prototype.toLowerCase() — all caps to lowercase

📖 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()

str.toLowerCase() returns a new string with all letters converted to lowercase.

Challenge: Implement lower(str) that converts a string to lowercase.

lower('HELLO') // → 'hello'
lower('WORLD') // → 'world'

💡 Hints (1)