JS Practice — Built-in Objects

String() — convert array to string

📖 Usage Example

String(42)         // → '42'
String(true)       // → 'true'
String(null)       // → 'null'
String(undefined)  // → 'undefined'

Use String() to safely convert any value to its string representation.

String Constructor — Array Coercion

String([1, 2, 3]) calls .toString() on the array, joining with commas: '1,2,3'.

Challenge: Implement arrayToStr(arr) that uses String(arr) to convert a number array.

arrayToStr([1, 2, 3])  // → '1,2,3'
arrayToStr([42])       // → '42'

💡 Hints (1)

• `String(arr)` internally calls `arr.toString()`, which joins elements with commas.