Languages & Runtimes

38+ min ago   (340+ words) Railsのプロジェクトを触っていると、db/structure.sql という巨大なファイルに出会います。 「これ何？勝手に書き換わるけど触っていいの？」と戸惑いがちなこのファイルを、初心者向けにまとめます。 結論：DBの「完成形の設計図」 structure.sql は、ひとことで言うと 今のデータベースの構造を、ゼロから丸ごと再現するためのSQL命令をまとめた「完成形の設計図（スナップショット）」 です。しかもRailsが自動で生成・更新するファイルで、人が手で書くものではありません。 中身はこんなイメージです。 CREATE TABLE `deals` ( -- 「案件」テーブルを作る命令 `id` bigint unsigned NOT NULL, `name` varchar(255),... ); CREATE TABLE `contacts…...

19+ min ago   (464+ words) Here's the sample data we'll use throughout — a table of user login dates: User 1 logged in three days straight, skipped the 4th, then logged in two more days. That's two islands — a 3-day streak and a 2-day streak — separated by one…...

1+ hour, 19+ min ago   (315+ words) GameGPU The developer of the open source dlss5-neural-amd project has released version 0.5.0, the key innovation of which is an experimental bridge for 32-bit games Since a 32-bit application cannot directly load the 64-bit HIP 7 runtime, the system is split into…...

54+ min ago   (191+ words) I thought I was writing the cleanest one-liner of my life. To solve Two Sum, I stored 1-based indices in an unordered_map so I could check for complements directly inside an if statement: It passed. But it took 3ms. Why would two…...

10+ hour, 20+ min ago   (420+ words) AUSTIN, Texas — September 14, 2026 — South today released findings and methodology from an internal review of 310 WordPress projects completed or assessed over 22 months, documenting differences in delivery and technical outcomes among the reviewed engagements. The review used project records available to South,…...

9+ hour, 56+ min ago   (170+ words) Kalyani Marathe, Artidoro Pagnoni, Tomasz Limisiewicz, Margaret Li, Mike Lewis, Luke Zettlemoyer, et al. Kalyani Marathe, Artidoro Pagnoni and colleagues from the University of Washington and Meta FAIR, including Mike Lewis, Luke Zettlemoyer and Srinivasan Iyer, compare distilled byte-level and…...

5+ hour, 25+ min ago   (130+ words) Pushed v2.4.0 of bro.js (my zero-boilerplate Express alternative) and figured I'd write up what changed instead of just dumping a changelog. Used to be you had to wire up your own Redis client and babysit connection state. Now you just…...

2+ hour, 10+ min ago   (143+ words) What Redis actually is, why everyone talks about it, and where it fits in a real-world backend. When I first heard about Redis, I had …...

7+ hour, 29+ min ago   (1234+ words) Before choosing a location, you need ping series and traceroutes from player networks, followed by a test session on the game server. Together, these help evaluate latency, jitter, and packet loss at different times of day. Responses to service-level requests…...

2+ hour, 27+ min ago   (757+ words) Raft is the consensus algorithm that powers etcd, CockroachDB, and Consul. It’s described in a 2014 paper as “more understandable than Paxos” — which is true, but implementing it correctly is still surprisingly hard. I built raftkv: a full production-grade Raft-based distributed…...