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what is instance in JavaScript


what is instance in JavaScript

By : Jefen
Date : November 18 2020, 03:49 PM
To fix the issue you can do Recently I try to learn design pattern in JavaScript. So I choose Singleton Pattern as my first pattern. But the problem is when I read this code. , Imagine you have a class like this
code :
Car { 
      var color, 
      var model, 
      var property
}


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Ruby/Rails: Is it possible to execute a default method when calling an instance (@instance == @instance.all IF "all

Ruby/Rails: Is it possible to execute a default method when calling an instance (@instance == @instance.all IF "all


By : Massimo Manco
Date : March 29 2020, 07:55 AM
This might help you This isn't really possible. When you write @instance you aren't really calling an instance as you describe, you're getting a reference to the object that @instance refers to.
The reason it seems to work with the collections for Rails' associations is that the the association objects are instances of Array that have had some of their methods overridden.
Implement javascript instance store by returning existing instance from constructor

Implement javascript instance store by returning existing instance from constructor


By : user4719562
Date : March 29 2020, 07:55 AM
Does that help I wouldn't use extend for this, I think having a separate "factory" is the right idea. It will allow you to extend your models without fears of side effects.
From the annotated source backbone does some weird stuff with extend, I haven't quite wrapped my head around it. (Also check out inherits) So lets skip it for now and stick with your working solution.
code :
var makeStoreable = function(model){
  var StoreModel = function(attr, opt){
    if(!attr || !attr.id){
      // The behavior you exhibit here is up to you
      throw new Error('Cool Models always have IDs!');
    }
    if(this.store[attr.id]){
      this.store[attr.id].set(attr, opt);
    }else{
      var newModel = new model(attr, opt);
      this.store[attr.id] = newModel;
    }
    return this.store[attr.id];
  };
  StoreModel.prototype.store = {};
  return StoreModel;
};

var CoolModel = Backbone.Model.extend({});

CoolModel = makeStoreable(CoolModel);

var a = new CoolModel({
    id: 4,
    coolFactor: 'LOW'
});

var b = new CoolModel({
    id:4,
    coolFactor: 'HIGH'
});

console.log(a===b); //true!
console.log(a.get('coolFactor') === 'HIGH'); //true!
how many maximum concurrent users can a tomcat instance, jboss instance and weblogic instance handle?

how many maximum concurrent users can a tomcat instance, jboss instance and weblogic instance handle?


By : el_pato
Date : March 29 2020, 07:55 AM
wish of those help First, it's not structs, it's "Struts" and no springs but "Spring". Although you have provided your hardware configuration, I would strongly suggest you to use JMeter to do the load testing of your application in your production environment before going live. That would give you a better picture rather than calculating on theories. Look here https://www.digitalocean.com/community/tutorials/how-to-use-apache-jmeter-to-perform-load-testing-on-a-web-server
How to get first instance to last instance of a number in a string in javascript regex/ object error?

How to get first instance to last instance of a number in a string in javascript regex/ object error?


By : bigpix2000
Date : March 29 2020, 07:55 AM
it helps some times You need to parse your response to a JS object before you can access it using JS object methods:
code :
curl.request(optionsRun, function (error, response) {
  var ID = JSON.parse(response);
  setTimeout(function () {
    console.log(ID.id) ;
  }, 2000);
});
How do you create an instance of an instance in JavaScript

How do you create an instance of an instance in JavaScript


By : Kaustav Banerjee
Date : March 29 2020, 07:55 AM
wish helps you What you're looking for is a derived constructor and associated prototype, sometimes called a subclass.
In old-fashioned ES5 it looks like this:
code :
var Car = function(make, country) {
    this.make = make;
    this.country = country;
};
var Ferrari = function(currentPrice, miles) {
    Car.call(this, "Ferrari", "Italy");
    this.currentPrice = currentPrice;
    this.miles = miles;
};
Ferrari.prototype = Object.create(Car.prototype);
Ferrari.prototype.constructor = Ferrari;
class Car {
    constructor(make, country) {
        this.make = make;
        this.country = country;
    }
}
class Ferrari extends Car {
    constructor(currentPrice, miles) {
        super("Ferrari", "Italy");
        this.currentPrice = currentPrice;
        this.miles = miles;
    }
}
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