I can't solved this problem

Tell us what’s happening:

Your code so far

// Example
var firstNameLength = 0;
var firstName = "Ada";

firstNameLength = lastName.length;

// Setup
var lastNameLength = 0;
var lastName = "Lovelace";

// Only change code below this line.

lastNameLength = lastName.length;



Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/find-the-length-of-a-string

Problem is solved. Thanks all.

Thanks. problem solved.