• Liked Yaron Minsky
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    Yaron Minsky - Reactive Programming with Diff and Patch

    60 Mins
    Keynote
    Intermediate
    Writing reactive programs can be challenging. Such programs need to be able to react efficiently to changes as they stream in from the outside world, which often leads people to make their program logic incremental in an ad-hoc way, directly expressing their logic in terms of how to integrate a change, rather than as an all-at-once
    computation.
    But such ad-hoc incrementalization is complicated, and the resulting programs can be hard to reason about. In this talk, I'll discuss an approach that leverages the fact that functional data structures can often be diffed efficiently. I'll show how the ability to diff and patch can be integrated into a more general reactive programming
    framework to let you write programs which read like simple, all-at-once implementations of your program logic, but which perform like hand-optimized change-oriented programs.
  • Liked Eugenia Cheng
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    Eugenia Cheng - Category Theory and Life

    60 Mins
    Keynote
    Intermediate

    Category theory can be thought of as being "very abstract algebra". It is thought of as "too abstract" by some people, and as "abstract nonsense" by some others. In this talk I will show that while it is abstract, it is far from being nonsense. I will argue that the abstraction has a purpose and that broad applicability is one of the powerful consequences. To demonstrate this, I will show how I apply concepts of category theory to important questions of life such as prejudice, privilege, blame and responsibility. I will introduce the category theory concepts from scratch so no prior knowledge is needed. These concepts will include objects and morphisms, isomorphisms and universal properties.

  • Liked David Laing
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    David Laing / Ryan Trinkle - Front-end Development with Reflex

    480 Mins
    Introductory Workshop
    Intermediate

    There has been a lot of excitement about Functional Reactive Programming (FRP).

    Most of it has been about distant relatives of the original idea, which are nowhere near as powerful or as useful.

    The `reflex` library -- and the companion `reflex-dom` library -- were created in order to use FRP to do front-end development using Haskell.

    This workshop will give you hands-on experience with these libraries.

    The workshop will show attendees a new way to manage state and time-dependent logic, with significant benefits over the standard approaches when it comes to abstraction, composition and correctness.

    It will also make the case that when these ideas are applied to front-end development, they lead to something beyond what is delivered by libraries like `react` and `redux`.

  • Liked Vaibhav Sagar
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    Vaibhav Sagar - I Haskell a Git

    Vaibhav Sagar
    Vaibhav Sagar
    DevOps Engineer
    Zalora
    schedule 3 months ago
    Sold Out!
    30 Mins
    Talk
    Intermediate

    Git is the most widely used version control tool today, but what is actually happening when we perform a `git add` or a `git commit`? To answer this question I'm going to walk through a small implementation of Git in Haskell. Along the way we'll touch on functional data structures, content-addressable stores, and parser combinators. At the end we'll analyse an entire Git repository and talk about the practical applications and limitations of what we've built. My hope is that this knowledge will help you be less frustrated the next time you see a cryptic Git error message!

  • Liked Manuel Chakravarty
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    Manuel Chakravarty - Welcome to FP Introductory Workshop

    480 Mins
    Introductory Workshop
    Beginner

    Functional programming has become inevitable. New programming languages draw inspiration from the functional paradigm; old programming languages retrofit support for functional programming; and development teams change their coding style to adopt the best functional programming idioms. We are clearly experiencing a paradigm shift in our industry.

    Due to its academic roots, functional programming sometimes seems unapproachable, with unfamiliar jargon, obscure concepts, and bewildering theories. It doesn’t have to be like that.

    In this one-day series of lectures and hands-on workshops, we will translate the jargon, demystify the concepts, and put the theories into practice. There is nothing inherently difficult about functional programming. In fact, its main aim is to simplify programming and to make it more widely accessible. Functional programming is about being able to understand one function without the million lines of code it is a part of. It is about code reuse. It is about modularity and keeping code easy to change and refactor. These are all goals of good program design that every developer appreciates. Based on this common ground, we will explore functional programming together and see how it can help us to achieve these design goals. In fact, by learning the fundamentals of functional programming in Haskell, we can improve program design in mainstream languages, such as Javascript and C++, and even more so, in hybrid languages, such as Scala and Swift.

    Throughout the day, we will explain the most commonly used functional programming terminology. You will learn the fundamentals of Haskell, one of the most popular functional programming languages. In the process, we will look at a lot of concrete code to understand what functional programming is all about and how to use it in your own programs. In the workshops, you will have plenty of opportunity to write code yourself, experiment, and ask questions. It’ll be fun!

    Bring your laptop and your curiosity and by the end of the day, functional programming will be another tool in your toolbox, and you will be ready to enjoy the main YOW! Lambda Jam conference.

  • Liked Yaron Minsky
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    Yaron Minsky - Introduction to OCaml

    480 Mins
    Introductory Workshop
    Intermediate
    The goal of this workshop is to get you a basic familiarity with OCaml and the tools you'll need to be effective working in the language. It will be aimed at experienced programmers who don't know OCaml, and don't necessarily know any functional programming.
    The workshop is organized around a set of exercises that should take you through the basics of the language, up through building a simple client/server application using Async RPC.
    In addition to that, we hope to teach people how to use the latest tools for OCaml, including installing dependencies with opam , building your code with Dune, using Merlin for IDE-style functionality like type throwback and go-to-definition, and writing expect tests to visualize what your code is doing. We'll also show you how to write a simple web-game using js_of_ocaml.
  • Liked Edward Kmett
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    Edward Kmett - Combinators Revisited

    45 Mins
    Invited Talk
    Intermediate
    Back in the 80's, one approach to compiling functional programming languages was to compile down to combinators such as SKI. John Hughes' initial work on supercombinators changed the way folks thought about compiling functional languages and caused folks to turn away from this approach by customizing the combinator set to your particular program. Then Lennart Augustsson's work on implementing supercombinators more efficiently sealed the deal. GHC's compilation technique is a descendant of this school of thought.
    But what did we give up to get to where we are? Let's explore a bit of alternate history.
  • Liked Ryan Trinkle
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    Ryan Trinkle - Full-Stack Haskell, from Prototype to Production

    45 Mins
    Invited Talk
    Intermediate

    Three years ago, I quit my job to bet everything on the proposition that Haskell could excel not just for specialized, high-assurance software, but for the kinds of software that millions of engineers work on every day. I had previously built backends with Haskell, with the wonderful experience of code that works reliably, a team that doesn't step on each others' toes, and an ease of refactoring that let us keep the codebase clean without risking regressions. But now, GHCJS and FRP had finally become reliable enough to trust in the real world. It was a game changer: Haskell could now build world-class graphical user interfaces, too, and deploy them as single page web apps — in theory.

    In practice, there were many obstacles along the way. However, I found that even with the need to blaze new trails from time to time, our overall pace was far faster than anything I had seen in the imperative tech stacks I'd worked with before. Strong types and pure values decreased bug counts and made code much more readable. Some former backend developers who had scrupulously avoided frontend development told me that they now enjoyed working on the frontend, too.

    Since then, I've worked with the community to continue building infrastructure to expand the areas where we can use Haskell to get real work done. Enabling mobile development required bug fixes to GHC, a rearchitected approach to cross-compilation in Nixpkgs, and bindings to native APIs. To scale up to larger projects, we've improved existing tools and created new tools that make developer workflows simpler, faster, and more discoverable. And to make Haskell app development more accessible to beginners and professionals without Haskell experience, we've made more and more functionality available out of the box.

    In this talk, I'll show you the tools that are available today and the challenges that lie ahead. I hope you'll come away with a broadened understanding of how Haskell can be applied in your own professional projects — and how the theory of functional programming can be a potent practical tool.

  • Liked Tony Morris
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    Tony Morris / Edward Kmett - Let's Lens

    480 Mins
    Introductory Workshop
    Intermediate

    Let's Lens presents a series of exercises, in a similar format to the Data61 functional programming course material. The subject of the exercises is around the concept of lenses, initially proposed by Foster et al., to solve the view-update problem of relational databases.

    The theories around lenses have been advanced significantly in recent years, resulting in a library, implemented in Haskell, called lens.

    This workshop will take you through the basic definition of the lens data structure and its related structures such as traversals and prisms. Following this we implement some of the low-level lens library, then go on to discuss and solve a practical problem that uses all of these structures.

  • Liked Jacob Bass
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    Jacob Bass - Higher Kinded Types in a Lower Kinded Language: Functional Programming in Kotlin (Code Jam)

    Jacob Bass
    Jacob Bass
    Engineering Manager
    Ordermentum
    schedule 15 hours ago
    Sold Out!
    90 Mins
    Code Jam
    Beginner

    It's hard coming back down to the earth of a JVM based language after spending time with Haskell and OCaml. The type systems are enviable, and the abstractions available are incredibly powerful.

    Yallop and White's paper on Lightweight Higher-Kinded Polymorphism has been an inspiration for many libraries seeking to add functional abstractions to languages that don't support them. For Kotlin, one library is [Arrow](arrow-kt.io), which provides incredibly powerful abstractions over native language capabilities like co-routines, reactive-streams and nullable types.

    This code jam will demonstrate functional programming in Kotlin with the Arrow library, how the abstractions it provides can improve your code, and how this magic that provides higher-kinded types works under the hood.

  • Liked Vaibhav Sagar
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    Vaibhav Sagar - Your First Functional Deployment!

    Vaibhav Sagar
    Vaibhav Sagar
    DevOps Engineer
    Zalora
    schedule 1 month ago
    Sold Out!
    90 Mins
    Workshop
    Beginner

    Functional programming is wonderful, but what happens after we're done writing code (functionally) and we need to put it in production? The most popular solution is to write a shell script that manually performs the work of installing dependencies, configuring the target, and running our software. This approach is hopelessly imperative and lacks reproducibility, immutability, and simplicity, things we otherwise take for granted. Can we do better?

    The Nix package manager and ecosystem brings the functional programming approach to bear on the the problems of installing, configuring, maintaining, and upgrading software, and allows your development and operations teams to realise the promise of functional programming to move faster, break nothing, and sleep better at night.

    In this workshop I'll walk you through the process of making your first functional deployment and effectively dealing with change. I hope that after this you will be inspired to take a closer look at Nix and see what it can do for you and your team!

  • Liked Mark Hibberd
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    Mark Hibberd - Hanging on in Quiet Desperation: Time & Programming

    Mark Hibberd
    Mark Hibberd
    Head of Technology
    Kinesis
    schedule 1 month ago
    Sold Out!
    30 Mins
    Talk
    Intermediate

    Time has a profound impact on the complexity of the systems we build.

    A significant amount of this software complexity comes from either an
    inability to recall previous states or the inability to understand
    how a state was arrived at.

    From the foundations of AI, LISP and functional programming [1], to
    causality in distributed systems [2], to the more grungy practices of
    immutable infrastructure, or the unreasonable effectiveness of
    fact-based approaches to large scale data systems; the ability to
    adequately cope with time, and the change and conflict it inevitable
    creates, is a common thread to being able to build and reason about
    these systems.

    This talk looks at the impact of time on system design. We will walk
    through examples of large-scale systems and their battles with
    complexity. At the end of the talk, the audience should start to see
    the common spectre of time and have an appreciation of how
    understanding time is fundamental to maintaining clarity, correctness
    and reliability in systems.

    [1] Situations, Actions, and Causal Laws
    John McCarthy
    http://www.dtic.mil/dtic/tr/fulltext/u2/785031.pdf
    [2] Times, Clocks and the Ordering of Events in a Distributed System
    Leslie Lamport
    https://amturing.acm.org/p558-lamport.pdf

  • Liked Colin Fleming
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    Colin Fleming - Developing an IDE for Clojure code

    Colin Fleming
    Colin Fleming
    Owner/Developer
    Ideogram Limited
    schedule 1 month ago
    Sold Out!
    30 Mins
    Talk
    Intermediate

    Cursive is an IDE for Clojure, based on the IntelliJ framework. In contrast to the majority of Clojure development environments, Cursive uses static analysis of the source code to work its magic rather than using runtime inspection of a live system via the REPL. IntelliJ provides a sophisticated indexing infrastructure, and this in combination with static analysis allows many interesting features which are difficult or impossible to achieve with a traditional REPL-based environment. Essential code navigation tools such as Find Usages and refactorings such as Rename become possible, and using IntelliJ's code inspections can provide error marking and static analysis of code, right in the editor. This ability to see problems immediately provides an even shorter feedback loop than working in the REPL.

    I'll discuss some of the challenges of developing a traditional IDE for a language as flexible as Clojure, including the implementation details of how to deal with syntax extensions from macros. I'll also talk about the various ups and downs of developing much of it in Clojure, and why some of it is also developed in Kotlin. I'll also talk about why I believe our editors should be syntax aware, not just text based.

  • Liked Sam Ritchie
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    Sam Ritchie - Implementing the Elm Architecture for iOS in Swift

    Sam Ritchie
    Sam Ritchie
    Chief Codesplicer
    Codesplice
    schedule 1 month ago
    Sold Out!
    30 Mins
    Talk
    Intermediate

    Elm, for a long time the flag bearer of Functional Reactive Programming on the web, recently switched to a simpler pure functional architecture, citing 'ease of use'. Those of us that have worked on complex reactive mobile apps can sympathise with this - using FRP injudiciously in your app can make the code difficult to understand and near impossible for new developers to pick up.

    So are we able to apply some of the techniques and patterns from Elm into iOS apps? It turns out the Elm architecture is a really great fit for Swift & iOS - it allows us to:

    • reserve our FRP hammer for the use cases that make the most sense
    • separate out a simple, consistent, and highly testable pure functional core, and
    • provide a flexible, yet easily understood & applied set of architectural building blocks.

    This session will cover the basics of implementing and using an Elm-style architecture in a Swift app, will include lessons learnt in a real-world implementation, pitfalls/benefits, and implementation considerations should you adopt the approach in your own app.

  • Liked Ivan Lazar Miljenovic
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    Ivan Lazar Miljenovic - I Streamed a Stream

    Ivan Lazar Miljenovic
    Ivan Lazar Miljenovic
    Data Engineer
    IAG
    schedule 1 month ago
    Sold Out!
    90 Mins
    Code Jam
    Intermediate

    Many people are familiar with Haskell stream processing libraries such as pipes or conduit. However, they can be a bit daunting to newcomers: they contain both input and output types in the same representation and they require all these new operators rather than using well-known function composition.

    The streaming library by Michael Thompson takes a simpler approach to represent how to stream data through your code. It offers a more familiar API to anyone used to using lists, whilst still offering a lot of power and flexibility. It also compares very well in terms of performance: conduit's fusion framework tends to use a similar structure!

    In this workshop we will have an overview of the streaming ecosystem and how it compares to pipes and conduit, and start using it to efficiently process large amounts of data.

  • Liked Christopher Biggs
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    Christopher Biggs - Functional Frontends with Elm

    30 Mins
    Talk
    Intermediate

    Functional programmers are lovers of simplicity and order. Developing for the Web has become nothing like either of these. The number of tools and libraries you need to learn seems to multiply without end, and getting them to work together can be a nightmare.

    What if there was a language and environment that had no external dependencies, required no complex packaging tools, runs in the web browser, and oh yes, it's purely Functional.

    The Elm Architecture (consisting of the Elm functional language, and a way of applying it to web development) aims to allow fast iterative development of beautiful web apps in a functional language. Hundreds of easy-to-install libraries give you

    Most elm tutorials stop at the "hello world" level and sweep the complexity of large applications under the carpet. This presentation goes beyond the bare essentials to show you how my team builds real world applications in Elm that incorporate non-elm javascript libraries while still retaining as much of possible of the simplicity, type-safety and ease of refactoring that Elm brings.

    Ports are Elm's mechanism for interaction with the non-functional, loosely typed Javascript runtime. I'll show you practical ways to interact with tools such as Amazon Cognito and the Leaflet mapping engine from within your Elm application, keeping the non-functional glue code to the barest minimum.

  • Liked Josh Godsiff
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    Josh Godsiff - The Human Side of Haskell

    Josh Godsiff
    Josh Godsiff
    Software Engineer
    Arbor Networks
    schedule 1 month ago
    Sold Out!
    30 Mins
    Talk
    Beginner

    I've been writing Haskell at Arbor Networks for about a year now, and while there are certainly a ton of benefits on the technical side, and a lot of interesting concepts, some of the most profound (and least discussed) impacts of Haskell occur on the personal and team levels.

    This is a talk about what I've learned about the human side of Haskell over the passed year. It touches on

    • How it makes it easier to think through problems and express yourself.
    • How it facilitates clear communication within teams.
    • How it allows for more agile decision making.
    • How it makes good practices the easy and natural thing to do
    • Some of the challenges and negative impacts it has.

    It may be of interest to anyone curious about what Haskell is like as a full-time, production language at a commercial company, or to people who are interested in a viewpoint beyond or other than a technical one.

  • Liked Cameron Joannidis
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    Cameron Joannidis - An Intuitive Guide to Combining Free Monad and Free Applicative

    30 Mins
    Talk
    Intermediate

    The usage of Free Monads is becoming more well understood, however the lesser known Free Applicative is still somewhat of a mystery to the average functional programmer. In this talk I will explain how you can combine the power of both these constructs in an intuitive and visual manner. You will learn the motivations for using Free Structures in the first place, how we can build up a complex domain, how we can introduce parallelism into our domain and a bunch of other practical tips for designing programs with these structures. This will also give you a deeper understanding of what libraries like Freestyle are doing under the hood and why it is so powerful.

  • Liked Andrew McCluskey
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    Andrew McCluskey - Property-based State Machine Testing

    30 Mins
    Talk
    Intermediate

    Automated testing is key to ensuring the ongoing health and well being of any software project, giving developers and users confidence that their software works as intended. Property based testing is a significant step forward compared to traditional unit tests, exercising code with randomly generated inputs to ensure that key properties hold. However, both of these techniques tend to be used at the level of individual functions. Many important properties of an application only appear at a higher level, and depend on the state of the application under test. The Haskell library hedgehog, a relative newcomer to the property based testing world, includes facilities for property-based state machine testing, giving developers a foundation on which to build these more complicated tests.

    In this talk, Andrew will give you an introduction to state machine property testing using hedgehog.He'll start with a quick refresher on property based testing, followed by a brief introduction to state machines and the sorts of applications they can be used to model. From there, he'll take you on a guided tour of hedgehog's state machine testing facilities. Finally, Andrew will present a series of examples to show off what you can do and hopefully give you enough ideas to start applying this tool to your own projects. The application being tested will be a servant web application, and examples will include testing fundamentals such as content creation and deletion, uniqueness constraints, and authentication.

    An intermediate knowledge of Haskell and familiarity with property based testing will be beneficial,but not essential. The slides and demo application will be available after the talk for people to study in detail.

  • Liked Simon Belak
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    Simon Belak - Transducing for fun and profit

    Simon Belak
    Simon Belak
    Mad Scientist
    Metabase
    schedule 1 month ago
    Sold Out!
    30 Mins
    Talk
    Intermediate

    Transducers -- composable algorithmic transformation decoupled from input or output sources -- are Clojure’s take on data transformation. In this talk we will look at what makes a transducer; push their composability to the limit chasing the panacea of building complex single-pass transformations out of reusable components (eg. calculating a bunch of descriptive statistics like sum, sum of squares, mean, variance, ... in a single pass without resorting to a spaghetti ball fold); explore how the fact they are decoupled from input and output traversal opens up some interesting possibilities as they can be made to work in both online and batch settings; all drawing from practical examples of using Clojure to analize “awkward-size” data.

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