Articles

Tutorials and write-ups on Kotlin, Minecraft datapacks with Kore, Svelte and the side projects I build along the way.

Showing 10 articles

• July 9, 2026 8 min read updated September 30, 2026

  How I Built This Portfolio in Kotlin with Kobweb

  The story and the tech behind ayfri.com, a portfolio written entirely in Kotlin with Kobweb and Compose for Web.

  kotlinkobwebcompose for webcompose htmlkotlin/js+5

• June 22, 2026 7 min read

  Build a Boss Fight Datapack with Kore

  Build a complete Minecraft boss fight in Kotlin with Kore - a legendary weapon with item components, a custom boss, an OOP boss bar, particle VFX, and a state machine driving the whole fight.

  minecraftdatapackkorekotlintutorial+8

• April 30, 2026 6 min read

  Building GPT Images (gpt-images.ayfri.com)

  How and why I built a SvelteKit client for OpenAI image and video generation, how storage and pricing evolved, and what the project taught me.

  sveltesveltekitopenaigpt-imageimages api+8

• February 4, 2026 4 min read

  Svelte 5 State in Classes Simplifies My Code

  How Svelte 5 `$state` in class fields made Atom Clicker managers smaller and more maintainable.

  sveltesvelte 5stateclassesrunes+5

• March 1, 2025 5 min read updated February 14, 2026

  Datapack Generators

  A modern overview of datapack generators and why Kore stands out for ambitious projects.

  minecraftdatapackdatapack generatorkoresandstone+5

• November 30, 2024 10 min read

  Mastering kotlinx.serialization: Advanced Techniques and Tricks

  Explore advanced techniques and tricks for mastering kotlinx.serialization in Kotlin, including custom serializers, enum serialization strategies, polymorphic serialization, and performance optimization.

  kotlinx.serializationkotlin serializationcustom serializersenum serializationpolymorphic serialization+3

• May 18, 2024 2 min read updated June 22, 2026

  Detect an entity in a zone with Kore

  Detect when a player enters a specific area in Minecraft using a Kore Kotlin library. Learn how to create a datapack that triggers an event when a player enters a defined zone.

  minecraftdatapackkorekotlintutorial+5

• May 18, 2024 4 min read updated June 22, 2026

  Simple Timer Datapack with Kore

  Create a timer datapack that displays a message every 20 seconds using the Kore library for Minecraft.

  minecraftdatapackkorekotlintutorial+4

• May 18, 2024 3 min read updated June 22, 2026

  Creating an Hello World Datapack with Kore

  Learn how to create a simple Minecraft datapack that displays a "Hello World" message using the Kore library.

  minecraftdatapackkorekotlintutorial+3

• November 12, 2023 7 min read updated June 22, 2026

  Introduction to Datapack Creation with Kore in Kotlin

  Learn how to create Minecraft datapacks using Kore in Kotlin.

  minecraftdatapackkorekotlintutorial+3