A friendly programming language from the future. It's similar to Go and is also influenced by Oberon, Rust, Swift. Is it really feasible, though, to build a programming language around this idea? It is a statically typed compiled programming language designed for building maintainable software. Unison is a typed language largely influenced by Haskell, Erlang and a research language called Frank. If you're curious to learn about the guts of the Unison codebase format, you can check out the v1 codebase format specification. When editing scratch files, any relative names not locally bound in your file will be resolved by prefixing them with the current namespace of .mylibrary. Let's edit square and instead define square x (just for fun) as the sum of the first x odd numbers (here's a nice geometric illustration of why this gives the same results): Notice the message says that square is "ok to update". You'll only rerun a test if one of the individual definitions it depends on has changed. The same core idea forms the basis for a runtime that robustly supports dynamic code deployment, allowing a single Unison program to describe entire elastic distributed systems. When we added square, we were at the root, so square and its tests are directly under the root. In Unison, the ‘codebase’ is a somewhat abstract concept (unlike other languages where a codebase is a set of files) where you can inject definitions, somewhat similar to … For example we refer to base.Nat as simply Nat. Sunday, January 26, 2020. When any such file is saved (which we call a "scratch file"), Unison parses and typechecks that file. Instead of starting a function from scratch, often you just want to slightly modify something that already exists. This is important: Unison isn't doing a bunch of text mutation on your behalf, updating possibly thousands of files, generating a huge textual diff, and also breaking a bunch of downstream library users who are still expecting that definition to be called by the old name. The prompt shows us which namespace we are currently in. Any lowercase variable in a type signature is assumed to be, Function arguments are separated by spaces and function application binds tighter than any operator, so, Note: there's nothing special about the name. Unison is a cross-platform music production studio. Siloed services managed by separate companies. and are paths from the root of this tree and relative names (like math.sqrt) are paths starting from the current namespace, which you can set using the namespace (or equivalently cd) command: Notice the prompt changes to .mylibrary>, indicating your current namespace is now .mylibrary. We will often do use .base at the top of our file to refer to all the basic functions and types in .base without a fully qualified name. I'm currently writing a bytecode interpreter for a compiled programming language I am going to make in the near future. It takes a Boolean expression and gives back a list of test results, of type [base.Test.Result] (try view Test.Result). You will be able to directly refer to a function, rather than have to import an entire codebase. It takes an argument called x and it returns x multiplied by itself. The > square 4 on line 6 of the file, starting with a > is called a "watch expression", and Unison uses these watch expressions instead of having a separate read-eval-print-loop (REPL). So far they only exists in our scratch file. Let's try this out. The testing library supports writing property-based tests like this. Unison's type system won't let you do I/O inside one of these watch expressions or anything else that would make the result change from one evaluation to the next. As I said, I rename things obsessively, but this has a cost. ... We will introduce bits and pieces of the core Unison language and its syntax as we go. Code is published using the push command and libraries are installed just via the pull command (recall how in the quickstart guide, we installed the base libraries with a pull). Unicon 13.1 Binaries are now available for download at sourceforge. We do need something else to make it nice to work with content-addressed code. *, ++, or foo. Function reuse/sharing is minimal You start to appreciate the simplicity of the idea and see the need for it everywhere ("this would be a lot easier if the code were content-addressed..."). It also tells us that square is "ok to add". Part of the fun in building Unison was in working through the implications of what seemed like a great core idea. Unisonweb.org is a low-traffic web project, safe and generally suitable for all ages. square should have the property that square a * square b == square (a * b) for all choices of a and b. Eff is a functional programming language based on algebraic effect handlers.This means that Eff provides handlers of not only exceptions, but of any computational effect, allowing you to redirect output, wrap state modifications in transactions, schedule asynchronous threads, and much much more…. ☝️ Using alias.term instead of move.term introduces a new name for a definition without removing the old name(s). Copy. If you want to follow along with this document (highly recommended), this guide assumes you've already gone through the steps in the quickstart guide. The fact that things were done a certain way in the 1970s is not a good reason to keep doing them, especially if they make programming worse. If you haven't already, you should totally check out Brian Tiffin's awesome Unicon Programming Page. If we do test again, we'll get the newly cached results. But the longer you spend with the odd idea of content-addressed code, the more it starts to take hold of you. This page is powered by a knowledgeable community that helps you make an informed decision. Unison is different to rsync, which is a mirroring tool. nat comes from test - test.nat. Perhaps also a tool to deploy such programs to the cluster would be useful. Unison: a new distributed programming language. The code you are editing can be run interactively, right in the same spot as you are doing the editing, with a full text editor at your disposal, with the same definitions all in scope, without needing to switch to a separate tool. Wholly based on a talk by Paul Chiusano. If you're interested in the Unison programming language (unisonweb.org) and attending Strange Loop this year, join this group! Before getting going writing Unison code, you can configure UCM to set author and license information. Unison Computing is hiring an Infrastructure Engineer, see our jobs page! But let's be honest that it's a compromise, and not forget to improve things later. Unison: a friendly programming language from the future unison.cloud: the worldwide elastic computer (coming soon) Type systems and UX: an example CSS … At Lambda World Seattle Co-Founder of Unison Computing, Rúnar Bjarnason find out all about the Unison language, its type system, developer experience, all that makes Unison unique. This lets us use anything from the base namespace under the root unqualified. It’s a modern, statically-typed purely functional language, similar to Haskell, but with a unique ability to desc Install →. To make this happen, Unison just changed the name associated with the hash of foldl in one place. Unison will have a uniform feel in accordance with the community's overall opinions. Now put the following in your scratch file: This defines a function called square. Try doing edit square from your prompt (note you can use tab completion): This copies the pretty-printed definition of square into you scratch file "above the fold". Intercommunication is difficult, done mostly via APIs. So how does that work? If we were in a different namespace, we would need to change the pull command from using the relative path base to the absolute path .base. We’ll make a more finished release generally available soon. Let's add a test for our square function: Save the file, and Unison comes back with: The check function has type Boolean -> Test.Result. Absolute names (like .base.Int) start with a . Unison is a functional language that treats a codebase as an content addressable database[1] where every ‘content’ is an definition. Let's rename that to List.foldLeft to make things clearer. You can use namespace . Is this not something that could be done in Haskell by defining a new monad type? And when you issue an add command, the definitions are put directly into this namespace. As a result, a Unison codebase can be versioned and synchronized with Git or any similar tool and will never generate a conflict in those tools. Download Unison - Music Production Studio for free. The Unison codebase format has a few key properties: If you haven't already worked through the quickstart guide, let's download the Unison base library to the .base namespace: This command uses Git behind the scenes to sync new definitions from the remote Unison codebase to the local codebase. We're used to thinking about our codebase as a bag of text files that's mutated as we make changes to our code, but in Unison the codebase is represented as a collection of serialized syntax trees, identified by a hash of their content and stored in a collection of files inside of that .unison/v1 directory. graphic-homepage-hero. As a result, changing the name(s) associated with a definition is easy. Unison is an open source functional programming language with special support for building distributed, elastic systems. If you type test at the Unison prompt, it will "run" your test suite: But actually, it didn't need to run anything! The Unison namespace is the mapping from names to definitions. It's not arbitrary or strange, but a logical and sensible choice with tremendous practical benefits. Try out the following commands (new syntax is explained below): Here, we did a type-based search for functions of type [a] -> [a], got a list of results, and then used the view command to look at the nicely formatted source code of one of these results. Switch to the Unison console and type add. Keep your ucm terminal running and open up a file, scratch.u (or foo.u, or whatever you like) in your preferred text editor (if you want syntax highlighting for Unison files, follow this link for instructions on setting up your editor). This is the basis for some serious improvements to the programmer experience: it eliminates builds and most dependency conflicts, allows for easy dynamic deployment of code, typed durable storage, and lots more. Overview Version History Q & A Rating & Review. Created by Chiusano, Arya Irani and Rúnar Bjarnason, Unison was inspired by Haskell, Erlang, and Frank, a trio of functional programming languages. Be introduced to the new programming language Unison! Let's try this out. The square function and the tests we've written for it are not yet part of the codebase. Try out the following command (you can use tab completion here if you like): Notice that view shows the foldLeft name now, so the rename has taken effect. Because of the append-only nature of the codebase format, we can cache all sorts of interesting information about definitions in the codebase and never have to worry about cache invalidation. When rendering code, a minimal set of use statements is inserted automatically by the code printer, so you don't have to be precise with your use statements. December 15, 2019 Tweet Share More Decks by Philip Schwarz. Great! OK, go drink some water, and then let's learn more about Unison's interactive way of writing and editing code. Notice that Unison inserts precise use statements when rendering your code. Names in Unison look like this: math.sqrt, .base.Int, base.Nat, base.Nat. 52.7k members in the ProgrammingLanguages community. Read what people are saying about it.. Popular links. My book, Functional Programming in Scala, uses Scala as a vehicle for teaching FP. There's one more ingredient that makes this work effectively, and that's functional programming. Unison takes the concept of Nix further and instead of just giving each package a unique identifier, it gives one to every semantic unit in a codebase. At the Strange Loop conference in St. Louis, Missouri, earlier this month, Paul Chiusano, founder of Unison Computing, gave the audience a tour of Unison, an emerging programming language designed for building distributed systems. More Info. That is why I was surprised by the refactoring capacity of this new programming language called Unison. > Unison is a new programming language, [...] similar to Haskell, but with a unique ability to describe entire distributed systems with a single program. The codebase manager lets you make changes to your codebase and explore the definitions it contains, but it also listens for changes to any file ending in .u in the current directory. Feedback and improvements are most welcome! Twitter • GitHub • LinkedIn • RSS. 64 votes, 17 comments. Some programming languages allow functional programming while others either encourage or even enforce it. reverse is defined using List.foldl, where l is a needless abbreviation for left. For instance, Unison is a statically-typed language and we know the type of all definitions in the codebase--the codebase is always in a well-typed state. He lives and works in Somerville, MA. For example, when renaming a function, you have to modify all references, or, what is the same, you have to modify all the files where there are functions or methods that invoke the renamed function. That is: an optional ., followed by one or more segments separated by a ., with the last segment allowed to be an operator name like * or ++. You should get something like: You've just added a new function and some tests to your Unison codebase. It began as an experiment: rethink all aspects of the programming experience, including the core language, runtime, tooling, as well as code versioning and publishing, and then do whatever is necessary to eliminate needless complexity and make building software once … Luckily, Unison keeps a cache of results for expressions it evaluates, keyed by the hash of the expression, and you can clear this cache at any time without ill effects. Or at the very least, if we can't have this, let's have programming be reasonable. The use .base is a wildcard use clause. Unison is an open source functional programming language with special support for building distributed, elastic systems. That is: an optional ., followed by one or more segments separated by a ., with the last segment allowed to be an operator name like * or ++. When you're starting out writing some code, it can be nice to just put it in a temporary namespace, perhaps called temp or scratch. Needless complexity and difficulties should be stripped away, leaving only that exhilarating creative essence of programming that made many of us want to learn this subject in the first place. No builds, no dependency conflicts, and not forget to improve things later definition without the. In Washington human-friendly names the fly, right when it 's printing out the.! Purely functional language unison programming language Unison, the exciting and innovative new functional programming language with special support for distributed. Well, for instance use.base.List map ll make a more finished release generally available.... 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