Weekly Recap – June 1st, 2025

Java, Spring Boot, JavaScript, Kotlin, SQL, and More LeetCode

This week kept things moving across Java, Spring Boot, JavaScript, and Kotlin. I added a couple more SQL-focused articles on Substack and revamped my Java LeetCode series with a few new ones. I also pulled the voiceovers from the Leetcode posts, i’ve been wanting to do more audio or short YouTube walkthroughs, but I’m not happy with the mic I’ve been using. At some point, I’ll get a better setup and start that up again.

I’ve finally settled on a good system for what and when to email here on Substack, like I mentioned in last week’s recap. You’ve probably noticed I post a decent number of articles, usually daily, so sending an email for each one doesn’t really work. I’m happy sticking with these weekly recaps, along with the occasional update or announcement when there’s a new series or a bigger batch worth sharing. I’ll keep posting individual articles throughout the week as usual.

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Substack Exclusive

What Happens When You Delete Properties in JavaScript Objects

LeetCode #8: String to Integer — Solved in Java

LeetCode #7: Reverse Integer — Solved in Java

LeetCode #6: Zigzag Conversion — Solved in Java

Combining Tables With JOINs That Actually Match What You Want

Finding Missing Data Gaps in SQL Tables

Medium Articles

Java Topics and JVM Mechanics

• Why String Interning Changes Memory Behavior in Java

• When Null Checks Are Added by the JVM and Why

• What Triggers JVM Deoptimization During Runtime

• What Controls Method Inlining in Java Programs

• Reading Files from the Local Disk Using FileReader and BufferedReader

Spring Boot Topics

• Building Multi Tenant Applications With Spring Boot

• Mapping Enums in JPA Entities with Spring Boot Projects

• Working with JSON Patch vs Merge Patch for Partial Updates in Spring Boot APIs

• Running SQL Scripts Automatically at Spring Boot Startup

• Setting Up Read Replication with Spring Boot Using JPA

• Using Java Records with Spring Boot DTOs

• Adding Swagger UI to Document Spring Boot APIs

JavaScript Internals

• Event Timing Tricks That Only Work in JavaScript Microtasks

• Keeping Scope Clean with Block Bindings in JavaScript

• What JavaScript SharedArrayBuffer Actually Lets You Do

• Keeping Things Weak with JavaScript WeakRef and FinalizationRegistry

• Turning Objects into Arrays and Back in JavaScript

• Canceling Fetch Requests in JavaScript with AbortController

• Optional Chaining in JavaScript Works Differently Than You Think

Kotlin Topics

• How Companion Objects Work Behind the Scenes In Kotlin

• Kotlin Coroutines and What Suspension Actually Means

More Java, Kotlin, Spring Boot, and JavaScript are already scheduled for next week on Medium. I still haven’t circled back to Gradle or Rust like I’ve been meaning to, but I’m glad I was able to fill out the SQL side of things and add more to the Java LeetCode series this past week.