JS Practice — Built-in Objects

String.prototype.at() — second-to-last character

📖 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() — Index -2

str.at(-2) returns the second-to-last character.

Challenge: Implement secondToLast(str) using .at(-2).

secondToLast('hello') // → 'l'
secondToLast('abc')   // → 'b'

💡 Hints (1)