Currently, I am working on building a school management system. One issue I encountered is related to the creation of global objects in my backend when a teacher sends a post request. I am wondering whether multiple teachers accessing the server will result in the creation of multiple global objects or if they will all access and potentially overwrite the same object.
When you mention creating a global object inside a route, are you referring to creating a property on:
1. global object itself -
global.myGlobalObj = { some-var: 'some-val' }2. process object -
process.myGlobalObj = { some-var: 'some-val' }3. express-app - possibly like app.set('myGlobalObj', someOb)
or perhaps on another global object. This would allow every request-response cycle to access the same object.
However, it is not advisable for any system you plan to develop. The main reasons include:
It is unstable. In the event of your application crashing, any request relying on the current value of your global object will not complete properly since that value was lost/reset with the crash.
This approach does not follow the principles of REST architecture, which emphasizes statelessness and self-sufficiency in requests.
Globals go against Object Oriented Programming and Functional Programming paradigms. Global variables can make your application more vulnerable, less clear, and difficult to test.
Possible Solutions
If variable access performance is not critical, consider storing the variable in your database with an index and retrieving it for each request. Alternatively, use an in-memory database like Redis.
Our web application has a feature that automatically loads more content when the bottom of the page is reached. Here's how it works: $window .on('scroll', function () { var $this = $(this) ; if ($this.scrollTop() == $do ...
A few months ago, I began a React project using create-react-app and now I am interested in transitioning the project from JavaScript to TypeScript. I discovered that there is an option to create a React app with TypeScript by using the flag: --scripts-v ...
let changeClassDisplay = document.getElementsByClassName('sidebar'); for (var i = 0; i < changeClassDisplay.length; i += 1) { changeClassDisplay[i].style.display = 'block'; } I encountered an issue with this code whe ...
Currently, I am facing an issue while trying to install the gatsby CLI using the following npm command: npm install --global gatsby-cli I suspect the problem might be due to lack of admin access. Does anyone have suggestions on how to resolve this error? ...
In my current project, I am utilizing express.js along with twig.js 0.9.5. My goal is to have autoescape enabled for all variables in each template. Although I came across this page suggesting that it should be the default behavior starting from version ...
I'm currently working on implementing an add to cart functionality using jQuery. When the add to cart button is clicked, the product name and image should be displayed. I can achieve this statically but I need help figuring out how to dynamically retr ...
Recently, I decided to delve into learning three.js and followed the getting started code on the official documentation. However, I encountered a frustrating issue where the scene refused to render, leaving me completely perplexed. Here is my index.html: ...
After receiving suggestions from sonarQube, I am attempting to switch out my original regular expression with RE2. However, upon installation, the following error message appears: Error: Cannot locate module './build/Release/re2' Important note ...
I am currently working on a TODO list project with functions to save and delete records already in place. However, I am facing challenges with the functions for marking items as important and done. One method I use is to retrieve saved items from Local St ...
I have encountered an issue while trying to write a Mocha chai test for a Nodejs API that was previously tested using Supertest. Strangely, the test always passes even when I intentionally specify wrong expected parameters. Below is the code snippet of th ...
I am using postman with form-data to add a "Tournament" document through express.js and mongoose. If I were to make a get request by id, the resulting document should appear as follows: { "game_id": "62c97fd41755a3ff2a530f06", "matches": [ ...
I'm encountering an issue with Protractor while trying to access a variable that stores the return value of "elements.all". As someone who is new to Protractor, I wasn't sure how to select elements by a custom attribute. Thankfully, I received so ...
I am attempting to link the same action to 3 checkboxes, with a different outcome for each: var checkboxes = { 'option1' : 'result1', 'option2' : 'result2', 'option3' : 'result3', }; ...
Recently, I encountered an issue with the default HTML5 code snippet. My custom background looked perfect except for a pesky black arrow appearing on the right side. In this image, you can see the problematic black arrow that needs to be removed. I attemp ...
In my PHP script, I am querying a database and formatting the results as JSON: $query = mysql_query($sql); $rows = mysql_num_rows($query); $data['course_num']=$rows; $data['course_data'] = array(); while ($fetch = mysql_fetch_assoc($q ...
Is there a parser generator available that can take a Javacc grammar file (.jj) and produce a JavaScript parser instead of Java? If not, what would be involved in converting the .jj file into a format that ANTLR can interpret (since it has the capability ...
I'm currently facing difficulties sending css files using express. In my project structure, I have a src folder which contains the app.js file for the express code, and another folder named "public". Inside the public folder, there is an experience.ht ...
I am trying to query a document in Mongodb (2.6.1) using pure JSON without using ObjectIds. According to the mongodb extended json documentation, I expected the code db.collection.findOne({"_id": {"$oid": "51b6eab8cd794eb62bb3e131"}}) to work but it is th ...
Currently, I have implemented a parent directive for an entire view to interchange templates based on the outcome of a promise. .directive('myDirective', function(myService) { var rootDir = '/path/to/templates'; return { ...
Currently working on a PHP project that involves a dropdown select button in a webpage. The goal is to call a JavaScript function whenever the value of the dropdown changes, and then pass this selected value to retrieve additional details from a MySQL da ...