Day 3 -

June 7th

Track 1 (Olympic Room)

14:30 - 15:15

The Making of the com.lihaoyi Ecosystem

This talk will cover:

  1. How the com.lihaoyi ecosystem got started a decade ago, and how it has grown over time: in projects, in usage, in maintainers and organization

  2. How com.lihaoyi differs from other Scala ecosystems such as ZIO, Typelevel, or Akka: by being executable pseudocode, to minimize the disconnect between what you want your code to do and how to write it.

  3. The core principles of the com.lihaoyi ecosystem: a balance between high-performance, type-safety, power, and ease of use, ““pushing down”” complexity into the Scala language, rather than ““building up”” on top of it, to greatly simplify the user experience

  4. Some of the unusual implementation techniques I used to implement the com.lihaoyi projects: cakes, mutable state, virtual classes, free applicatives, bit-bashing, etc.

  5. What are some of the major failures within the com.lihaoyi ecosystems, projects I launched with great optimism only to go nowhere: Scalatex, Scalite, Scala.Rx, Autowire, Ammonite-Shell, etc.

Haoyi Li

Haoyi graduated from MIT with a degree in Computer Science and Engineering, and since then has been a major contributor to the Scala community. His open source projects have over 10,000 stars on Github, and are downloaded over 7,000,000 times a month. Haoyi has used Scala professionally to build distributed backend systems, programming languages, high-performance web applications, and much more.


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