This is a list of suggested concepts that a Scala developer should have a good understanding.

This is a study note for Play JSON and Play WS.

This is a stduy notes for sttp. sttp is an open-source Scala Http client library that provides a clean and programmer-friendly API to make HTTP requests. It can use one of many wrapped backends, such as akka-http, async-http-client, http4s or OkHttp.

This is a stduy notes for Bloop and Metals.

本文总结了一些 Scala 开发工具的最佳实践。

计算机性能的天花板在硬件，当所以 CPU 满负荷运行真正应用任务时，性能最高。如果 CPU 空转或很多时间用于进程/线程等系统管理任务，性能自然会有损失。1999 年提出了The C10K problem: 在 1GHZ CPU，2GB RAM，1Gbps  以太网配置，大概 1200 美金的计算机硬件已经可以同时支持 10，000 客户的并发访问。所需的工作都在操作系统和应用软件层面。30 年过去了，可以做个历史回顾和现状分析。

This is a study note of the Akka Stream. It is based on the Stream documents and only covers basic concepts of stream creation, execution and management.