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Hakjoon Sim
Developer who lives in Seoul,
like programming and doing nothing.
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Migrating to Monorepo and Replacing Deno with Fastify
Jul 29, 2026
Why I moved this site to a Turborepo monorepo and rewrote the API server from Deno to Fastify with Drizzle ORM

React - state management (Sante)
Apr 20, 2025
React state management with Context, SWR, Zustand and Sante

React - custom hook for persisting state (usePersistedState)
Apr 07, 2021

Blog renewal with Gatsby
Jan 14, 2020

Nginx - Configure Nginx as reverse proxy for Nodejs(Express)
Nov 08, 2019

Docker - Setting up a MongoDB Replica Set with Docker
Sep 17, 2019

Javascript - Convert String into Number
May 16, 2018

Javascript(ES6) - Map and Set
May 03, 2018

Android - Implementing Zip function using LiveData
Apr 02, 2018
Let's implement zip function like Rx using LiveData

Android - Replace EventBus with LiveData
Feb 12, 2018

Kotlin - Kotlin's magic with let, apply, run and with
Feb 01, 2018

Android - Lambda with Retrolambda
Mar 03, 2017

Java - How to override hashCode
Feb 06, 2017

Java - Inner Class
Jan 10, 2017

Vim 8
Jan 05, 2017
Vim 8.0 is released!!

Strict mode in Javascript
Mar 24, 2016

Shell expansion
Mar 14, 2016

Bach Cello Suite No.1
Mar 09, 2016
The music makes me relaxed.