JS Practice — Built-in Objects

String.prototype.substring() — omit end goes to end of string

📖 Usage Example

const str = 'Hello, World!'
str.substring(7, 12)   // → 'World'
str.substring(5, 2)    // → 'llo' (args swapped)
str.substring(7)       // → 'World!'

Use substring() to extract characters between two indices, automatically swapping them if start is greater than end.

String.prototype.substring() — Omitting End

If you omit the second argument, .substring() goes to the end of the string.

Challenge: Implement fromStart(str, n) that returns everything from index n to the end.

fromStart('hello world', 6) // → 'world'

💡 Hints (1)