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JavaScript Object-Oriented JavaScript Getters and Setters Creating Setter Methods

Posted by Michael Dinnall
Michael Dinnall
6,730 Points

how to do a if statement within a setter

how to do a if statement within a setter for this challenge

creating_setters.js 
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){
    this._major = major;
    if(
  }
}

var student = new Student(3.9, 60);

2 Answers

Adam Beer
Adam Beer
11,314 Points

If the student's level is Junior or Senior, the value of the backing property should be equal to the parameter passed to the setter method. If the student is only a Freshman or Sophomore, set the "major" backing property equal to 'None'.

You use some information from inside the level getter therefore you can use "this" keyword. (Now "this" equal to "level") So when you compare the "Senior" or "Junior" property and the "Freshman" or "Sophomore" should get some information from inside the level getter. That's why we need to go back for information. The code does not know what its value for "string". I'm sorry my English is not perfect. Hope this help.

Adam Beer
Adam Beer
11,314 Points

Please check this short course. You understand how can use "this" keyword.(https://teamtreehouse.com/library/understanding-this-in-javascript)

Michael Dinnall
Michael Dinnall
6,730 Points

Thank you Adam Beer your explanation made sense and cleared up a lot. I completed forgot about how "this" worked. Much appreciated.

Adam Beer
Adam Beer
11,314 Points

Good luck! Happy coding!

Adam Beer
Adam Beer
11,314 Points
Adam Beer
Adam Beer
11,314 Points

Hi Michael! Just create if/else if and inside the first if create a logical statement and this equal to this._major = major;. I hope you can solve the second else if with this instructions. Hope this help.

 if (this.level === 'Junior' || this.level === 'Senior' ) {
        this._major = major;
      }
Michael Dinnall
Michael Dinnall
6,730 Points

I'm confused on why you're calling the level getter simply as this.level. Can you elaborate some more if possible?

Jonathan Santiago
.a{fill-rule:evenodd;}techdegree
Jonathan Santiago
Full Stack JavaScript Techdegree Student 7,998 Points

This was a huge help! Thanks