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tanin

Set up IntelliJ to run scalatest's FunSpec

I finally set up IntelliJ to be able to run a FunSpec test. For so long, I didn't know why it didn't work until I embarked on a short journey to find out. My FunSpec test is often complex with set up code and layers of

The correct way to model a timestamp range is [start, end)

Or things that are not mathematically precise will cause you pain down the line.

Building the load more mechanism for an infinite scroll

Let's set up the problem first. You have a list of posts and you want to show them "infinite-scroll"-style sorting from the newest post to the oldest post. Well, obviously, you can't just load every single post into the page at once. Therefore,

Play Framework: Session's Gotchas

I've just switched our cookies to Play's Session. I was previously under the impression that "Session" is temporary, as in the stored value isn't persisted after the browser is closed. After looking closely at it, Play's Session is implemented using

Integrate JobRunr into Play Framework

This blog shows you how you can integrate JobRunr with Play Framework. JobRunr is one of the popular background processing for a JVM application, but it is catered toward Java and Spring Boot. Since there's no popular Scala background processing framework, and I don't want to

A succinct early exit trick for Option in Scala

I've realised that return in Scala only apply to a method. This led me to a cool early exit trick that I use everywhere. It looks a bit off because I, for some reason, think return should have applied to the current lambda. But that's not

Java: Meridiem (am/pm) date parsing surprise

Our team was perplexed with the date parsing logic where it seemed we couldn't parse 11/19/2024 11:25 am or 11/19/2024 11:25 AM depending on the machine. I eventually decided to ask on Reddit's r/javahelp. It turns out that it

GraalVM and ChromeDriver in a Docker image for Render.com

This should work on Heroku or in any Docker-based deployment as well. Adding Chrome and ChromeDriver into a GraalVM Docker image isn't as straightforward as I thought. The main complication originates from the fact that GraalVM is lean. There are 2 problems from being lean: (1) microdnf as

Integrate New Relic into Play Framework

Yesterday I was choosing a monitoring system for our production app. I was looking at NewRelic, Datadog, and ScoutAPM. Unfortunately, ScoutAPM doesn't support JVM applications. It looks great though. I've eventually chosen NewRelic due to ease of integration. It's quite straightforward if you know

Connect Chromecast to a wifi with 2-step sign-in

A Chromecast doesn't support signing in to a wifi that requires you to sign in through a browser. You can imagine most hotels are using this kind of wifis. A wifi with 2-step sign-in is probably using a MAC address as an identifier. Therefore, a way to solve