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Latest — Jun 14, 2025

My experience migrating a PlayFramework app to Scala 3

I have a small PlayFramework app (https://superintendent.app) that I just migrated to Scala 3. Here are my learnings: The goods 1. Scala 2 syntax is still valid in Scala 3. Basically, 95% of the code still works as-is. 2. Cross-publishing one of my libraries to work with Scala

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One more reason to choose Postgres over MySQL

Almost always, I'd choose Postgres over any database for a new project because it's flexible and support multi-variances of scenarios that may require different performance characteristics. However, I don't generally feel strongly about MySQL vs. Postgres. Either seems fine.... until I've learned

Set up Programmable Tooltip to open Sublime with a specific file

Today I just set up a more complex and powerful use case: I now can select a file path and open the Sublime text to see that file. Occasionally, I'd see a file path in my terminal because it is printed by the program that is running, and

Set up the vim mode in IntelliJ to be aware of CamelCase

I work with Java and Scala quite a lot, and last week I've realized that hey maybe I should set up w and b in vim to jump to the next word in CamelCase. There is this cool vim plugin: https://github.com/chaoren/vim-wordmotion – However, the vim

My secret productivity app when I worked at Stripe

The tool: ProgrammableTooltip.com (disclaimer: I'm the creator) Back in 2019, I just joined Stripe and worked on Billing Analytics. I was working the timezone part of it. Side note: daylight saving is insane. I found myself needing to convert epoch-from-millis to human-readable date extremely often when I

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