This video was recorded at Lambda Days 2022 -https://www.lambdadays.org/lambdadays2022 osnap! Painless & massive regression test generation for OCaml | Valentin Chaboche - Software Engineering Intern at Nomadic Labs ABSTRACT The presentation is a story of building data access library for a functional language. Crucial design decisions and their reasons will be described, showing the process of growing it up over time from the minimal solution to a fairly feature-rich product. The presentation will bring up following topics: - place of data access mechanisms in overall application architecture and its impact on library design - representing queries as functions; using runtime code generation to implement query execution and result mapping - controlling side-effects and connection management with Async and Reader monad composition - making DSL for transforming results to application-level data structures - building dynamic query framework with templating and poor-man existential types. • Follow us on social: Twitter: https://twitter.com/LambdaDays LinkedIn: https://www.linkedin.com/company/lambda-days/ • Looking for a unique learning experience? Attend the next Lambda Days conference near you! • SUBSCRIBE TO OUR CHANNEL https://www.youtube.com/channel/UC47eUBNO8KBH_V8AfowOWOw See what's coming up at: https://codesync.global