How to store returned value of an Anonymous function to a Variable in JavaScript?

Question

I am extremely new to JavaScript so please bear with me on this one. Here is a snippet of my code:

function Course(title, instructor, views){

  this.title= title;
  this.instructor = instructor;
  this.views = views;
  this.updateViews = function() {
    return ++this.views;
  };

}

var course1 =   new Course('JS', 'Sarun', 0);

console.log(course1.updateViews);

On execution however, I had expected the value of course1.updateViews to be 1. Instead, I get the entire function displayed in the console as follows:

ƒ () {
    return ++this.views;
  }

I am sure that this is a beginner's mistake. So can anyone please Correct me on this?

gurvinder372 · Accepted Answer · 2018-02-19 09:30:31Z

4

So can anyone please Correct me on this?

You need to invoke the function using ()

console.log(course1.updateViews());

function Course(title, instructor, views){

  this.title= title;
  this.instructor = instructor;
  this.views = views;
  this.updateViews = function() {
    return ++this.views;
  };

}

var course1 =   new Course('JS', 'Sarun', 0);

console.log(course1.updateViews());

answered Feb 19, 2018 at 9:30

gurvinder372

68.6k11 gold badges78 silver badges98 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Sarun Dahal Over a year ago

yup this helps!! thanks a lot!! Silly mistake from my side

Luong Dinh · Accepted Answer · 2018-02-19 09:35:35Z

0

Because in the Course object, you declared this.updateViews as function. if you wanna get return value of function, you need to invoke that by calling:

console.log(course1.updateViews());

if you wanna updateViews is static attribute you can change the way to declare this:

function Course(title, instructor, views){

  this.title= title;
  this.instructor = instructor;
  this.views = views;
  this.updateViews = ++this.views;

}

answered Feb 19, 2018 at 9:35

Luong Dinh

5694 silver badges17 bronze badges

Collectives™ on Stack Overflow

How to store returned value of an Anonymous function to a Variable in JavaScript?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related