Method error: Method name not defined

Question

Why isn't this code working? I'm trying to use the method to add up the properties and then assign the added up properties to its own value.

function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
    return birthHome + college + home1 +home2;
    };

    this.yearsAlive = calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me);

use this keyword inside method or method call as well – Venkat.R Jan 23 '16 at 16:28 — Venkat.R, Jan 23 '16 at 16:28
check my answer which has solution for you ! – Venkat.R Jan 23 '16 at 16:36 — Venkat.R, Jan 23 '16 at 16:36

score 1 · Accepted Answer · edited May 23 '17 at 12:16

You missed this keyword during your method / property call. Try like below.

  function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
      return this.birthHome + this.college + this.home1 + this.home2;
    };

    this.yearsAlive = this.calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me.yearsAlive); // output: 27

What is `this` keyword?

A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode.

Reference:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/this
How does "this" keyword work within a function?

Dmitri Pavlutin · Answer 2 · 2016-05-23T05:53:50.540

0

Update the constructor to:

function howLongILivedSomewhere(college, home1, home2) {
    this.birthHome = 18;
    this.college = college;
    this.home1 = home1;
    this.home2 = home2;

    this.calcYearsAlive = function() {
      return this.birthHome + this.college + this.home1 + this.home2;
    };

    this.yearsAlive = this.calcYearsAlive();
}

var me = new howLongILivedSomewhere(4, 2, 3);

console.log(me);

Use this keyword when you need to access the object properties (see here more details).

edited May 23 '16 at 05:53

answered Jan 23 '16 at 16:30

Dmitri Pavlutin

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Actually, that still didn't work. It gave me the Error message: calcYearsAlive is not defined. – Orbers Jan 23 '16 at 16:34
You're right. Answer updated. – Dmitri Pavlutin Jan 23 '16 at 16:38
Awesome! It worked this time. Thanks for your help! – Orbers Jan 23 '16 at 16:41

Method error: Method name not defined

2 Answers2

What is this keyword?

What is `this` keyword?