I don’t see a mistake.
Your code so far
// Example
var firstName = "Ada";
var lastLetterOfFirstName = firstName[firstName.length - 1];
// Setup
var lastName = "Lovelace";
// Only change code below this line.
var lastLetterOfLastName = lastName[lastName.lenght - 1];
Your browser information:
User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.108 Safari/537.36
.
Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-last-character-in-a-string