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  • Liked Aaron W Hsu
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    Aaron W Hsu - Programming Obesity: A Code Health Epidemic

    45 Mins
    Keynote
    Beginner

    Programs are getting fat. They're becoming slow. They're taking up more computing resources. They're getting harder to maintain and more complex from the ground up. Layer upon layer of sophistication is causing us to lose our ability to predict what software will do. Where's that bug? Why is everything going so slowly? Am I even using the right data structures? Where's that important point in the documentation again?

    What's happened to us? In this meta-dive into the nature of our approach to programming, we will explore some of the dangers of our current approaches to programming and the how/why of our current programming obesity problem. We will look at real case studies and see just how bad the situation can be.

    But we will also explore how we can battle these sources of obesity. In this passionate plea for code that we can gain control over again, we will look at examples of how we can return to a state of high-performance on all levels, from code size to code scalability. We will look at the principles that can help us to reach leaner, more efficient, more usable, less buggy code. We will hopefully find some light at the end of the tunnel, and how we can change our outlook on programming to push ourselves towards code that benefits not only ourselves, but also those that will come after us.

  • Liked Andrea Leopardi
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    Andrea Leopardi - Software Librarians

    Andrea Leopardi
    Andrea Leopardi
    Core Team Member
    Elixir Lang
    schedule 1 month ago
    Sold Out!
    45 Mins
    Keynote
    Beginner

    Libraries are the building blocks of software. All applications I've worked with make heavy use of libraries. But who writes the libraries? In this talk, I want to share my perspective as a library author, and talk about library design, open source, extensibility, documentation, and people.

  • Liked Anne Ogborn
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    Anne Ogborn - Introduction to Logic Programming and SWI-Prolog

    Anne Ogborn
    Anne Ogborn
    Software Engineer
    Hasura.io
    schedule 3 weeks ago
    Sold Out!
    480 Mins
    Workshop
    Beginner

    As machine learning matures, it is becoming obvious that we need explainable solutions. As functional programming matures it becomes obvious that we need inference and nondeterminism. And linked open data demands reasoning. This all day workshop will introduce the logic programming paradigm, in which programs are expressed as a set of logical rules and executed by finding proofs of queries.

    SWI-Prolog is the most highly developed and widely used language for logic programming.

    The language, which has been in continuous use in academic research settings since it's invention in 1972, provides unparalleled power. Many problems which would be difficult to express in other languages are simple in SWI-Prolog. SWI-Prolog is a 'batteries included' modern language, ready for real world tasks like web development and process control.

    In this dynamic hands on workshop we'll learn the basics of SWI-Prolog, and look at some of the amazing things it can do.

  • Liked Michael Snoyman
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    Michael Snoyman - Your first Haskell web app with WAI and Warp

    Michael Snoyman
    Michael Snoyman
    VP, Engineering
    FP Complete
    schedule 2 weeks ago
    Sold Out!
    45 Mins
    Tutorial
    Beginner

    Haskell's Web Application Interface (WAI- pronounced "why") provides an abstraction between web applications and web servers. This allows many different web frameworks (e.g., Yesod, Spock, and Servant) to share servers like Warp and middlewares.

    Haskell's web frameworks offer a wide variety of feature sets, type-level and metaprogramming, and intended use cases. And for most use cases, I would recommend using an existing web framework, which will help you avoid common pitfalls and more quickly address common use cases.

    But not today! In this tutorial, we're going to step through building a functioning web server using just the bare-bones WAI interface and Warp as a server. Familiarity with the basics of Haskell will be a plus, but this will be a talk open to all FP and Haskell skill levels.

  • Liked Michael Snoyman
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    Michael Snoyman - Applied Haskell Workshop

    Michael Snoyman
    Michael Snoyman
    VP, Engineering
    FP Complete
    schedule 2 weeks ago
    Sold Out!
    480 Mins
    Workshop
    Intermediate

    This full day workshop will focus on applying Haskell to normal, everyday programming. We'll be focusing on getting comfortable with common tasks, libraries, and paradigms, including:

    • Understanding strictness, laziness, and evaluation
    • Data structures
    • Structuring applications
    • Concurrency and mutability
    • Library recommendations

    By the end of the workshop, you should feel confident in working on production Haskell codebases. While we obviously cannot cover all topics in Haskell in one day, the goal is to empower attendees with sufficient knowledge to continue developing their Haskell skillset through writing real applications.

  • Liked Tony Morris
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    Tony Morris - An Intuition for List Folds

    45 Mins
    Talk
    Beginner

    In this talk, we go back to first principles, defining and examining the definition for a cons list, then take a look at the ubiquitous right and left fold functions on a list.

    The primary focus of this talk is to develop an intuition for how these functions work so that we can best decide when to apply them. Multiple programming languages will be used to help emphasise the independence of the gained intuition. This talk will generally be interactive with the audience as we solve problems and build confidence in our new knowledge.

    Knowing how to apply the various list fold functions is a common question by the student of FP. This talk aims to provide a solid, reliable answer to this question. No prior understanding of list folds is necessary.

  • Liked Tony Morris
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    Tony Morris - Zippers

    45 Mins
    Talk
    Intermediate

    The term zipper is a colloquial used to describe n-hole (most often, 1-hole) contexts. That is, a data structure that has a _hole_ or _pointer_ focused on a specific element with the ability to efficiently traverse to its neighbouring elements, providing an elegant solution for the need to efficiently traverse and _modify_ immutable data structures.

    In this talk, we will look at examples of zippers for canonical data structures such as lists and other products and sums. We will then define comonads and see the relationship between zippers and comonads.

    Most of this talk will be spent on the practical application of zippers in everyday programming. We will solve some simple problems using zippers. We will then contrast why we might use a zipper, compared to a lens.

    Finally, for a fun and interesting observation, we will look at the algebraic structure of products and sums, then compute the derivative of these structures. Turns out, a derivative of a data structure is its zipper ("McBride, Conor, et al (2005). ∂ for Data: Differentiating Data Structures").

  • Liked Morten Kromberg
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    Morten Kromberg - Delivering your APLs

    Morten Kromberg
    Morten Kromberg
    CTO
    Dyalog Ltd.
    schedule 2 weeks ago
    Sold Out!
    45 Mins
    Tutorial
    Beginner

    Most talks on APL at FunctionalConf have focused on the way array oriented programming allows you to quickly deliver concise and efficient solutions to problems with an analytical core. This talk will focus on the development environment, and follow the life of an APL code snippet from it's interactive discovery, via testing and debugging, through to delivery as a web service and a shared object, embedded into a solution implemented in Python.

  • Liked Aaron W Hsu
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    Aaron W Hsu - APL Training Wheels

    45 Mins
    Tutorial
    Beginner

    APL is getting a lot of attention lately due to its potential for very high performance portability and suitability for both rapid prototyping of complex solutions as well as deployment of complex algorithms to high-speed, modern parallel hardware. It has the potential to vastly improve the speed, scalability, and size of your code bases. But APL has a reputation as an intimidating language to learn.

    In this back to the basics tutorial, we will explore the core of APL, and focus on those areas that usually trip up the beginner in learning APL. We will also walk you through how to approach an APL expression, how to reason about them, and how to read them efficiently. We will teach you the skills that the expert APLer has internalized, and how you can work through these skills externally and explicitly in a way that will help you to eventually internalize these critical skills in a way that makes you efficient at using APL on real world problems.

  • Liked Tony Morris
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    Tony Morris - Introduction to Functional Programming using Haskell

    480 Mins
    Workshop
    Beginner

    We will be spending the day learning the fundamentals of Functional Programming (FP) using the Haskell programming language. The exercise material will be a condensed selection of the NICTA/course which is regularly held in Australia over three days.

    This one day session is targeted to experienced industry programmers who are looking to break into Functional Programming and develop the rudimentary skills and techniques that enable continued independent study. A refresher on Haskell syntax will be provided, however, it is highly recommended to practice with the syntax and development tools prior to obtain the best outcome for the day.

    You will be required to bring a suitable development machine (portable) for working through the exercises. You will also need to install Glasgow Haskell Compiler (http://www.haskell.org/ghc/) version 7.8 or higher on that machine prior to the day.

  • Liked Saurabh Nanda
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    Saurabh Nanda - Getting property-based testing to work after struggling for 3 years

    Saurabh Nanda
    Saurabh Nanda
    Founder
    Vacation Labs
    schedule 2 weeks ago
    Sold Out!
    45 Mins
    Talk
    Intermediate

    I got excited about property-based testing after hearing John Hughes talk at Functional Conf 2016. I tried it that year with QuickCheck, but failed miserably (it almost derailed the entire project delivery). I cribbed about it in my talk at Functional Conf 2017. In 2018, Srihari's talk got me excited again. This time, I tried with Hedgehog, and got it to work!

    This talk is about this journey and its learnings. We'll talk about how Hedgehog was used to test [1]:

    • A Postgres backed task/job queue
    • A small Wai/Servant based webapp

    And no, we will not talk about the most common (and completely useless) example of reversing a list!

    [1] Both of these are part of an open-sourced task/job queue library.

  • Liked Aditya Athalye
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    Aditya Athalye - Dr. StrangePipes or: How I learned to stop worrying && "function" in Shell

    Aditya Athalye
    Aditya Athalye
    Programmer
    λ
    schedule 1 month ago
    Sold Out!
    90 Mins
    Workshop
    Intermediate

    What scares the Shell out of people?

    Artefacts of the long and idiosyncratic history of Unix.

    We have so many powerful, stable, widely-available Unix tools and standards, but also plenty of inconsistencies, variants, and arcane caveats; enough to help us... surprise... ourselves in creative new ways. See that cliff you're currently falling off? Yeah, someone went down that road when you were still eating chalk in kindergarten. (Or perhaps you fell off it once before, when I was eating chalk in kindergarten, but it was so long ago that you forgot you've been there done that :-))

    Worse, there's no adult supervision, only user manuals. Within Shell's neon-lit environs, one must learn to tread with care, creativity, and cool calculation.

    One must learn to accept the silent echo as reward for success.

    Why go to Shell at all?

    Several of us already get by just fine with a few memorised spells from Shell. That's not a bad way to live, but we miss out on tremendous everyday value that we can unlock with the Unix way.

    For there exists a vast no-man's land between memorised tricks and large scale "designed" solutions; wherein no single software tool can really solve all the problems we encounter.

    Yet, any modern *nix PC has all one needs to adequately and speedily tailor-make solutions for almost any problem we may encounter in the underserved no man's land.

    Solutions that we can use effectively until we truly hit the kind of scale problems or domain complexity that merit use of specialised tools.

    Unix nature is deeply Functional

    The Unix tools philosophy naturally leads to functional architectures that can scale almost effortlessly. And functional programmers could do worse than learn to exploit such power.

    I'll just leave you with Douglas McIlroy's answer to "Read a file of text, determine the n most frequently used words, and print out a sorted list of those words along with their frequencies.", as seen in More Shell, Less Egg:

    tr -cs A-Za-z '\n' |
    tr A-Z a-z |
    sort |
    uniq -c |
    sort -rn |
    sed ${1}q

    A purely functional, automatically buffered data processing pipeline, built with standard reusable parts, written in 1986, directly usable on today's computers.

    Imaginative Functional Programmers (aren't we all?!) will find striking parallels between the facilities, concepts, and design principles available in their $Langs, and their *nix environments.

    No surprise, because in the dreamy mists of time, the wise hackers of Unix lore, and SmallTalk lore, and APL lore, and Lisp lore, and Forth lore etc... were all different, but they were all together, too.

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

    480 Mins
    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 Andrea Leopardi
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    Andrea Leopardi - Building a real-time, reliable, resilient web application in one day with Elixir and Phoenix

    Andrea Leopardi
    Andrea Leopardi
    Core Team Member
    Elixir Lang
    schedule 1 month ago
    Sold Out!
    480 Mins
    Workshop
    Beginner

    We'll explore how to built connected, real-time web applications using Elixir and the Phoenix framework.

    • Look at the basics of Elixir, or rather the things we need to dive into the workshop
    • Get started with the basics of Phoenix and how to build simple HTML web applications with it
    • Introduce channels and learn how to use them in order to communicate with clients in real time
    • Talk about distribution and how to work with Phoenix on multiple servers
    • Talk about LiveView and learn how to update data on a page from the server without any JavaScript

  • Liked Tarun Maini
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    Tarun Maini - Testing AI/ML Applications

    Tarun Maini
    Tarun Maini
    Team Lead
    Thoughtworks
    schedule 2 months ago
    Sold Out!
    90 Mins
    Workshop
    Intermediate

    With the seismic shift in industry QA’s testing approaches is also changing, we must know the right strategies and algorithms to test. One of the latest technology is Artificial/Machine Learning Applications like Self driving cars, Virtual Assistants. They have great impact in our life and most of our decisions, behaviour & destinations depend on them.

    So in this presentation/Workshop i would like to present all the ways/strategies/ challenges faced while testing AI/ML applications

  • Liked Mangala Kader
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    Mangala Kader - Understanding the pitfalls in Erlang / Elixir and steering clear from them

    45 Mins
    Talk
    Beginner

    Erlang has been in production for more than 30 years and a highly battle-tested robust system, which is being used by everybody including Telecom systems that provides 99.99% uptime. Elixir has been built on top of Erlang overcoming the shortcomings of the language and also using meta-programming, it has opened a new paradigm of looking at the language itself. I want to show what Elixir is to the audience and minute nuances that every experienced or inexperienced developer should be aware of before jumping into the magical erlang and elixir world.

  • Liked Alexander Granin
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    Alexander Granin - Hierarchical Free Monads and Software Design in Functional Programming

    Alexander Granin
    Alexander Granin
    Sr. Haskell Developer
    Juspay
    schedule 2 months ago
    Sold Out!
    45 Mins
    Talk
    Advanced

    Functional Programming is going through the same process of rethinking as Object Oriented Programming has passed already. FP today is not only something mystical, something barely applicable for day-to-day tasks, but rather a whole philosophy of building big, complex applications, with own tools, approaches and methodologies. We can see a lot of ideas about software design and architecture emerging from the FP community: talks, books, articles. We’re actively discussing Final Tagless, Free Monads, effect systems and other approaches, but it seems the theme not yet covered and we don’t know about possibilities we have.

    In this talk, I’ll tell you about the power of Free Monads in building complex applications in Haskell and PureScript. These applications will be satisfying the requirements like maintainability, testability, simplicity. You’ll know how to create a safe concurrent application state, how to divide the application into layers and how to keep the code sane. In fact, you can do the same with Final Tagless or extensible effects, but the approach with hierarchical Free Monads has some specific properties making it the best tool to separate concerns and create a very interesting eDSLs with different semantics.

    The talk is based on the ideas I’m describing in my book “Functional Design and Architecture”. I also gave several talks about this theme earlier (you can find all my talks here).

    I’ve used these ideas to build software for different companies, including Juspay (Bengaluru), Restaumatic (Poland), Enecuum (Hong Kong). We’ve created several interesting technologies that were not possible to make without Free Monads. Some of them are open sourced.

  • Liked Anupam Jain
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    Anupam Jain - Typesafe Functional SQL

    45 Mins
    Talk
    Intermediate

    We'll discuss how to use strongly typed functional programming to build a typesafe and highly declarative DSL to generate SQL, that allows better abstractions and minimises runtime errors. We'll focus on type systems, and build an intuition for row types and how it guarantees correctness for SQL. I'll cover some parts of actual SQL generation.

    A similar talk was given at IIIT Delhi earlier, however that was more geared towards beginners to Functional Programming (link below). I plan to give a more intermediate level talk this time.

  • Liked Kapil Reddy
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    Kapil Reddy - Handling and Compositing complex side effects in Clojure with Sanity

    Kapil Reddy
    Kapil Reddy
    Software Developer
    Helpshift
    schedule 2 weeks ago
    Sold Out!
    45 Mins
    Talk
    Intermediate

    At Helpshift, we face managing complexity of these side effects which touch 10s of different systems. Each side effect poses a failure scenario which can lead to it's own business decision. Compounded failures pose even more complexity. To add to the problems we extending the codebase to add new business logic regularly.

    I will present a solution which is a combination of Clojure and FP following techniques. We will also discuss how ideas when combined together can create an elegant solution,

    1. Data - Side effects definition as data

    2. Almost no syntax - Minimal definition

    3. Many functions for one DS - Multiple execution and failure recovery modes for side effects

  • Liked Harmeet Singh
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    Harmeet Singh - Type System: The Beauty And The Beast

    45 Mins
    Talk
    Intermediate

    The type system plays an important role in building type-safe applications that reduce runtime exceptions and developer mistakes. This sophisticated system is leveraged by Scala’s most famous functional libraries, such as Scala-Cats and ScalaZ. This feature-rich system allows implementing pure functional programming on the JVM. It is a beast due to its complex syntax, as it prevents developers from exploring its beautiful aspects like partially applying types in Scala. In this talk, we will tame the beast and use its beauty to solve real-life issues faced during coding. Our examples will be based on generics, constraints, type lambdas, and the kind projector plugin.

    The following are the learning objectives of this talk:

    1. Practical use cases of the type system using real-life coding examples.

    2. Implementing custom higher kinded types and handling partially applied types via type lambdas and the kind projector plugin.