JS Practice — Built-in Objects

String.prototype.at() — negative index

📖 Usage Example

const str = 'Hello'
str.at(0)    // → 'H'
str.at(-1)   // → 'o'
str.at(1)    // → 'e'

Use at() to access a character by index, supporting negative indices to count from the end.

String.prototype.at() — Negative Index

Negative indices count from the end: -1 is the last character, -2 is the second-to-last, etc.

Challenge: Implement lastChar(str) that returns the last character using .at(-1).

lastChar('hello') // → 'o'
lastChar('abc')   // → 'c'

💡 Hints (1)