Grouping elements in array by multiple properties is the closest match to my question as it indeed groups objects by multiple keys in an array. Problem is this solution doesn’t sum up the properties value then remove the duplicates, it instead nests all the duplicates in a two-dimensional arrays. Expect…
Tag: javascript
Fetch local JSON file from public folder ReactJS
I have a problem since two days; I want read a local JSON from my public folder on my React application created with react-app. This is my project structure: public data mato.json (my .JSON file) src components App.js Why I put my file in public folder? If I build my project with file in src folder, my file w…
Detect scale settings (dpi) with JavaScript or CSS
I’ve noticed that a small laptop with a 1920×1080 screen, windows 10 will auto adjust the scaling. I’ve seen it as high as 150%. Is there a way we can detect this? My media queries don’t kick in as they’re set in px. Answer Try accessing window.devicePixelRatio variable. The Windo…
How can I ignore certain returned values from array destructuring?
Can I avoid declaring a useless variable when array destructuring when I am only interested in array values beyond index 0? In the following, I want to avoid declaring a, I am only interested in index 1 and beyond. Answer Can I avoid declaring a useless variable when array destructuring when I am only interes…
CORS error, but data is fetched regardless
I have a generated React site I am hosting in an S3 bucket. One of my components attempts to fetch something when loaded: The url I am fetching is an AWS API Gateway. I have enabled CORS there, via the dropdown, with no changes to the default configuration. In my console, for both the remote site and locally …
Leaderboard ranking with Firebase
I have project that I need to display a leaderboard of the top 20, and if the user not in the leaderboard they will appear in the 21st place with their current ranking. Is there efficient way to this? I am using Cloud Firestore as a database. I believe it was mistake to choose it instead of MongoDB but I
Rails gem with javascript dependency
I’m writing a rails gem which requires angular, so I added it to my gem’s dependencies: s.add_dependency “angularjs-rails”, “~> 1.6.2” Now, how should I include angular ? I tried to add it directly in my gem’s main js script but sprockets fails with this kind of er…
ng2-ckeditor – how to customise the css loaded inside the editor itself?
I need to customise the ENTER key behaviour of ng2-ckeditor. I understand there is a config option as explained here. However as that link explains, I should use custom css: If you want to change it to control paragraph spacing, you should use stylesheets instead. Edit the contents.css file and set up a suita…
Firebase Cloud Firestore query not finding my document
Here’s a picture of my data: I’m trying to get that document. This works: It returns: I.e., if I know the document’s key I can get the document. This doesn’t work: It just returns No such document! What’s wrong with my query? Answer The difference in your two requests is that in …
Build error while compiling create-react-app
I am new to Reactjs and am started learning it. I have been trying to start a basic hello world program but its failing at compilation level. Created a start up hello-word program with create-react-app hello-world it gave me a nice folder structure with bunch of files. And Here you can see the compilation err…