This part covers the ZIO tests. It is based on the documents of, Testing Effects, Testing Use Case and ZIO test effects. ZIO makes tests first-class objects in that tests are values that can be passed, transformed and composed. ZIO tests are effects.

This is a study note of Quill: a query language DSL, named Quoted Domain Specific Lnaguage (QDSL), that supports SQL and Cassandra Query Language(CQL). It supports simple schema mapping by case classes and provides compile time query generation and validation.

Macro is widely used in popular Scala libraries such as Mill, Slick etc. Key concepts include reify, Context methods and Scala’s abstract tree syntax type Expr[T]. This article is based on Macro doc and the docs of Quasiquotes.

This is a study note of Scala.js. Scala.js brings strong typing and code share to web development. It runs faster than hand-written JavaScript and has good interoperability with JavaScript libraries. It comes with excellent editor support. Due to the complexity of build, this note also comes with a lot of mill build code.

This is a study note of uTest: a simple, intuitive testing library for Scala. It features a uniform syntax for writing and running tests using a uniform assertion syntax.

uPickle is a lightweight JSON and binary MessagePack serialization library for Scala. It is simple to use, flexible and easily customizable and has zero dependencies.

Cask is a Scala HTTP micro-framework inspired by Python’s Flask. This note covers the routes, decorators, custom endpoints and websockets.