Is there a more efficient way for instances of a class to keep track of how many have been created? Each instance should inherently know its own position in the group.
I initially considered using global variables, but I suspect there might be a better solution out there.
Here's an example of what I want to avoid:
class MyClass {
this.instanceId = (window.instanceCount == undefined) ? 0 : window.instanceCount + 1;
window.instanceCount = this.instanceId;
...
}
Utilize the static property and increment it within the constructor()
class MyClass{
static count = 0;
constructor(){
this.instanceId = ++MyClass.count;
}
}
let x = new MyClass();
let y = new MyClass();
console.log(MyClass.count) //2
console.log(x.instanceId); //1
console.log(y.instanceId); //2If you want to add a counter statically to your "class", you can do so by using a symbol to prevent name collisions. It's important to check whether you are using Burrito as a function or a class before incrementing the counter.
function Burrito() {
if (this instanceof Burrito) {
Burrito[Burrito.counterName]++;
}
}
Burrito.counterName = Symbol();
Burrito[Burrito.counterName] = 0;
Burrito.count = () => Burrito[Burrito.counterName];
new Burrito(); // 1
new Burrito(); // 2
Burrito(); // skipped
new Burrito(); // 3
console.log(Burrito.count());There is no requirement for the property to exist in the broader scope:
class AnotherClass {
static total = 0;
idValue = AnotherClass.total++;
}
A simple way to streamline class instances is possible.
class Example {
constructor() {
this.x = 50;
this.y = 60;
}
m2() {
this.z = 70;
}
}
let myObj = new Example()
totalProps = Object.keys(myObj).length;
console.log(totalProps) //-------------------2
myObj.m2();
totalProps = Object.keys(myObj).length;
console.log(totalProps) //-------------------3
Hello there! As a beginner in html and angularjs, I'm experimenting with dynamically assigning span width based on an angular js response. <div class="statarea" ng-repeat="x in names"> <div class="ratingarea"> <div class=" ...
I'm having trouble getting my markers to show different infowindows. No matter what I do, the markers always display the content of the last "contentString" in the loop. Despite reading through multiple posts on this issue, I haven't been able t ...
Currently working on developing a Dynamic Sub-menu for Wordpress, similar to the one shown here: . However, I am facing an issue with the width as it is set to 'auto' but not aligning the sub-menu properly. I would like the sub-menus to float lef ...
I am developing a website that displays comments on each user's page and allows other users to add comments. My goal is to have the comment form visible on the same page, so when a user adds a comment, it gets saved in the database and appears instant ...
I am incorporating react-select with isMulti functionality, where a list of options is provided. My goal is to have certain options automatically selected by default if they match the values in a given array. import React, { useState } from "react"; imp ...
My current dilemma involves working with an object that I've loaded using THREE.ObjectLoader(). This object consists of various elements, resembling a simple box made up of panels and sticks. My goal is to assign different textures to specific child ...
After stringifying a class object that contains a property in Uint8Array, and then parsing it later, the property is no longer in Uint8Array format. Here's an example: class Example { title:string; byteData:Uint8Array; ...
Exploring the possibility of using Angular JS with MVC 5.0, I am looking for a way to log the complete class Object into a database whenever an Insert/Edit/Delete operation is performed. Is there a library available in Angular JS that can help serialize ...
When it comes to reverting state location back by 1 step in Angular, we can utilize something along the lines of this.location.back();. This method works well unless the system redirects to the same URL but with different query parameters. In such cases, ...
Currently, I am utilizing the real simple WYSIWYG editor SCEditor for my website. I am curious about how I can precisely determine the current number of characters in its textarea and display them below it? Although I posted a question on GitHub, it seem ...
I am working on a website where I want to enhance the user experience by displaying output in a dialogue box upon click. The current setup involves the user selecting a vendor and time duration, with the results appearing below the Submit button. However, ...
I'm stuck trying to make sense of this error message, and my online search has hit a dead end. Any insights would be greatly appreciated! Attention: Prop type validation failed - expected prop type `leoInfo` to be a function from the `prop-types` pack ...
Creating a Ruby app for tracking bets, I have designed a small form that captures various details including date and match. However, the most crucial components of this form are the "stake" and "odd" text fields. To enhance user experience, I have incorpor ...
I'm currently working on developing a telnet chat server using node.js However, I'm facing an issue where the text I enter in multiple terminals is not being transmitted to other terminals. After opening several terminals, I enter the following ...
TLDR: Politely ask IE6/7 users to switch browsers without accessing content. In essence, I don't want people using IE7/6 on my web app. I was considering using a doc.write function after loading to replace the page with a message stating "Sorry, your ...
I am currently working on a loadfile function that is supposed to load an image after uploading. However, I am facing an issue with converting it to get its URL path. Whenever I try to do so, I encounter an error saying "URL.createObjectURL is not a func ...
I successfully created a website using only HTML, JavaScript, and jQuery without any server-side scripting or language. Within my website, I have a simple stream.html page that remains unstyled with no CSS formatting. <html> <head> </head& ...
I am looking to store values in a specific format: "somekey": "value1", "value2" My goal is to create a function that takes in "somekey" and returns "value1", "value2". Alternatively, I could initialize a collection in my JavaScript file and reference i ...
Looking to extract the value upon form submission in Angular, here is the code: In my Typescript: constructor(public navCtrl: NavController, public navParams: NavParams, public modalCtrl: ModalController, public formBuilder: FormBuilder, public alertCtrl ...
After running "protractor conf.js" without any issues, I decided to install protractor globally using the command "npm install -g protractor". However, after installing protractor globally, I encountered the following error message: internal/modules/cjs/lo ...