Question

45

Uncaught SyntaxError: Setter must have exactly one formal parameter

rated 0 times [ 52] [ 7] / answers: 1 / hits: 16095 / 9 Years ago, thu, november 19, 2015, 12:00:00

I'm trying to understand getters and setters on JS and I can't seem to get pass this error. Can anyone provide any insight as to why I'm getting this error?

var book = {

    year: 2004,

    edition:1,

    get newYear(){

        return Hello, it's  + this.year;

    },

    set newYear(y, e){

        this.year = y;

        this.edition = e;

    }

};

Uncaught SyntaxError: Setter must have exactly one formal parameter

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cierra

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3 Years ago

answered 9 Years ago kinsley · Accepted Answer

The setter function is called when you assign the value that setter represent:

var obj = {

  set a(newVal) { console.log(hello); }

}

obj.a = 1; // will console log hello

As you can see it doesn't make sense for a setter to take multiply arguments, but it gives you the freedom to manipulate the value before it is set:

var person = {

  surname: John,

  lastname: Doe,

  get fullname() {

    return this.surname +   + this.lastname;

  },

  set fullname(fullname) {

    fullname = fullname.split(' ');

    this.surname = fullname[0];

    this.lastname = fullname[1];

  }

};



console.log(person.fullname); // John Doe

person.fullname = Jane Roe;

console.log(person.surname); // Jane

console.log(person.lastname); // Roe