What is preventing me from looping through a class's prototype?

Looking for some help with this code snippet:

class example {b(){}}

for(const b in example.prototype)
    console.log(b)

Curious as to why the methods inside example.prototype are not logging. I've debugged it and can see them there.

This is for a project using nodejs.

Answer №1

When using a class declaration, the methods created on the prototype object are automatically set as non-enumerable. However, you can also manually make any object non-enumerable:

function CustomObject() { }

Object.defineProperty(CustomObject.prototype, "b", {
  value: function() { },
  enumerable: false
});

(The default values for the enumerable and writable flags are both false, so there's no need to specify them explicitly.)

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

The integration of HTML and CSS using ng-bind-html appears to be malfunctioning

<ion-item ng-bind-html="renderHtml(word[key])"> </ion-item> When referring to word[key], it represents: <ul> <li>item 1</li> <li>item 2</li> <li>item 3</li> </ul> This is the CSS being u ...

Looking for assistance with accessing elements using the "document.getElementById" method in Javascript

Below is the code snippet I am working with: <html> <head> <script> function adjustSelection(option) { var selectList = document.getElementById("catProdAttributeItem"); if (option == 0) { ...

What is the process for extracting the "user_id" from the token payload and inserting it into the JSON POST form in Django REST with SimpleJWT and Vue3?

After storing access and refresh tokens in my local storage, I have decoded the access token and found the "user_id" in the payload. However, I am struggling to comprehend how to include this "user_id" in a POST request to the REST API. Is it retrieved fro ...

Learn how to implement a call to 'next()' in Express and Node.js only after successfully creating schemas

I am currently developing an event app, and within my 'Event' schema, I have an array of 'Tag' schemas, allowing each event to be associated with one or more tags. Event: var EventSchema = new Schema({ ... tags: [{ type: Schema.Type ...

The Ajax request is failing to execute properly on newly appended elements

My comment system allows users to post comments which are then appended to the existing ones. Whenever a user hovers over a comment, a 'delete' button appears. Clicking on the delete button prompts a confirm dialog and upon confirmation, an ajax ...

The module 'AppModule' has unexpectedly declared a value of 'Component' that was not anticipated

Recently, I've been working on transitioning my application to the new angular2 webpack rc5 setup. I have successfully generated the app module using ng cli migration. However, I am facing an issue while trying to integrate a component from my own li ...

Utilizing jQuery to extract the value of a selected list item on click

I have been working on creating a list of items from JSON data and am facing an issue with retrieving the 'data-value' attribute of the clicked item. Here is my current code: const target = $('#list'); target.empty(); for (let i = 0 ...

The one-click button is functional on larger screens, while on mobile devices, only a double click will register

I am facing an issue in angular where a button works perfectly fine with one click on larger screens, such as Macbook. However, on iPhone, it requires a double click to function properly (it works fine on Android too). The alert triggers with a single cl ...

Setting up Npm Sequelize Package Installation

Could use some help with setting up Sequelize. Here's the current status: https://i.sstatic.net/MQH1I.jpg ...

Tally the number of sub-labels associated with each main label

In my Angular 9 application, I am looking to separate an array based on the lable field. Within each separated array, I would like to determine the count based on the subLable field. This is the array I am working with: [ {"id":1,"socia ...

Is it possible to send an ajax request to a user control file with the extension .ascx?

I am trying to interact with a user control on my page through ajax. Is it possible to make an ajax request directly to the user control (.ascx) instead of .aspx or .ashx files? ...

In JavaScript, it is not possible to retrieve the maximum or minimum value of an array

Hey there! I'm having some trouble finding the minimum and maximum values in an array. Can you help me figure out what's going on with my code? var repeated, studentsArray = [], marksArray = []; while (repeated !== 'n' && r ...

Guide to implementing Jest global Setup and Teardown in a Node.js application

I have integrated Jest tests into my Node.js project, with each test suite containing a beforeAll method that sets up a new test server and connects to a MongoDB database, and an afterAll method that shuts down the server and disconnects from the database. ...

The highlight_row function seems to be delayed, as it does not trigger on the initial onClick but works on subsequent clicks. How can I ensure it works properly right from the first click?

I developed an application using the Google JavaScript Maps API to calculate distances between addresses. I've encountered a bug where the row in the table is not highlighted on the first click, requiring a second click for the highlighting to take ef ...

Using setTimeout() in JavaScript to create a delay between functions

Is there a way to add a delay between the execution of each function in my program? Currently, I have the following setup: function function0() { setTimeout(function1, 3000); setTimeout(function2, 3000); setTimeout(function0, 3000); } While t ...

Challenges encountered when using setState to assign values

Just started using React and running into an issue with updating state when changes are made to a Textfield. I'm working with a functional component where the initial state is set using useState. I feel like I might be overlooking something simple... ...

Sending data using formData across multiple levels of a model in Angular

I have a model that I need to fill with data and send it to the server : export interface AddAlbumeModel { name: string; gener: string; signer: string; albumeProfile:any; albumPoster:any; tracks:TrackMode ...

Patience is key: techniques for real-time variable updates and calculations in JavaScript

Hi, I am currently working on creating a dashboard to calculate the total outstanding amount for my medicine suppliers using Next.js. Below is the code snippet for my "createPurchase" API: import PurchaseOrder from '../../models/PurchaseOrder' ...

Update the property of every model within a Backbone collection

Using the pluck method, we can extract an array of attributes from each model in a Backbone collection. var idsInCollection = collection.pluck('id'); // returns ["id1","id2"...] I am curious to know if there is a method that can assign an attri ...

The callback information is not being properly identified

I need help with deleting an entire row when the Delete button is clicked using jQuery. Here is my current approach: UPDATE: I have made final adjustments to the click function: $(document).on('click', '.delete-assignment',function () ...