JapanTech

Tech Brunch: Functional Programming Edition

A small brunch meetup near Iidabashi diving into functional programming and category theory: monoids, functors, monads, and their use in software.

When
Fri, June 26, 2026 · 11:45–12:45 JST
Where
Beltempo, Hotel Metropolitan Edmont, 3 Chome-10-8 Iidabashi, Chiyoda City · In person
Region
Kanto (Tokyo)
Organizer
Guidable
Language
EN
Source
Meetup
Summary
TechBrunch returns with a functional programming edition, gathering developers and the mathematically curious over a relaxed brunch at the Beltempo restaurant inside Hotel Metropolitan Edmont near Iidabashi. The session unwraps the abstractions of functional programming and category theory, aimed at people who find beauty in the mathematical foundations of software. Expect deep dives into concepts like monoids, functors, applicatives, and monads, plus discussions on how category theory shows up in real software design. Conversations also branch into adjacent fields such as algebra, graph theory, set theory, and topology. The crowd ranges from Clojure, Haskell, OCaml, and Scala enthusiasts to mathematicians and computer scientists applying these ideas in practice. This is a deliberately small gathering, so attendees should not expect a large crowd. First-time attendees who RSVP and are confirmed on the list get their meal for free as a welcome to the community.
About the community

A recurring, small-group brunch meetup for people who enjoy the mathematical foundations of software. Sessions are relaxed and discussion-driven, drawing functional-programming enthusiasts, mathematicians, and computer scientists who want to talk through category theory and its practical applications over a meal.

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