JS Practice — Built-in Objects

String.prototype.slice() — negative start (last N chars)

📖 Usage Example

const str = 'Hello, World!'
str.slice(7, 12)    // → 'World'
str.slice(-6, -1)   // → 'World'
str.slice(7)        // → 'World!'

Use slice() to extract a portion of a string by start and end indices, supporting negative indices.

String.prototype.slice() — Negative Start

A negative start counts from the end of the string. str.slice(-3) gives the last 3 characters.

Challenge: Implement lastThree(str) that returns the last 3 characters.

lastThree('abcdef') // → 'def'
lastThree('hi')     // → 'hi'

💡 Hints (1)