Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Object-Oriented JavaScript Getters and Setters Creating Setter Methods

Can any one please help me with this challenge?

I am getting this error: Cannot read property 'toLowerCase' of undefined with the code in the editor.

class Student {
    constructor(gpa, credits){
        this.gpa = gpa;
        this.credits = credits;

    stringGPA() {
        return this.gpa.toString();

    get level() {
        if (this.credits > 90 ) {
            return 'Senior';
        } else if (this.credits > 60) {
            return 'Junior';
        } else if (this.credits > 30) {
            return 'Sophomore';
        } else {
            return 'Freshman';
  set major(major) {
    if (major === "Senior" || major === "junior") {
        this._major = major;
    else if( major === "Freshman" || major === "Sophomore") {
        this._major = none;

var student = new Student(3.9, 60);
student.major = "Senior";

2 Answers

Steven Parker
Steven Parker
229,982 Points

Are you sure you're getting that error while working on this code? I don't see the "toLowerCase" method used here at all!

However, I do see a few issues that might impact this challenge:

  • the passed-in argument is being tested instead of the student's level
  • one comparison is for "junior" (with lower-case "j") instead of "Junior"
  • there's a reference to an undefined none identifier instead of a literal "None"

Thank you for taking time and addressing my issue. I grateful for it.