We do need something else to make it nice to work with content-addressed code. This lets us use anything from the base namespace under the root unqualified. A big question that arose: even if definitions themselves are unchanging, we do sometimes want to change which definitions we are interested in and assign nice names to. All the tests had been run previously and cached according to their Unison hash. It is a statically typed compiled programming language designed for building maintainable software. Part of the fun in building Unison was in working through the implications of what seemed like a great core idea. 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). We will introduce bits and pieces of the core Unison language and its syntax as we go. What may change is how definitions are mapped to human-friendly names. to move back to the root. > Unison is a new programming language, [...] similar to Haskell, but with a unique ability to describe entire distributed systems with a single program. use statements aren't part of your code once it's in the codebase. This presentation by Rúnar Bjarnason took place at Lambda World Seattle on September 18th, 2018 at the Living Computers Museum in Washington. Unison is an open source functional programming language with special support for building distributed, elastic systems. Or at the very least, if we can't have this, let's have programming be reasonable. Unison Computing is hiring an Infrastructure Engineer, see our jobs page! A friendly programming language from the future. ☝️ Using alias.term instead of move.term introduces a new name for a definition without removing the old name(s). In the meantime, anyone is welcome to help with alpha testing. When taken to its logical endpoint, this idea of content-addressed code has some striking implications. Let's rename that to List.foldLeft to make things clearer. 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. 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 ++. And when you issue an add command, the definitions are put directly into this namespace. The first line, use .base, tells Unison that you want to use short names for the base libraries in this file (which allows you to say Nat instead of having to say base.Nat). Unisonweb.org is a low-traffic web project, safe and generally suitable for all ages. Reflective programming language; On the other hand, Unison provides the following key features: Statically-typed; Next generation programming language; Purely functional language; Unison is an open source tool with 2.53K GitHub stars and 110 GitHub forks. So far they only exists in our scratch file. We’ll make a more finished release generally available soon. The prompt shows us which namespace we are currently in. Feedback and improvements are most welcome! No more running the same tests over and over again! So one thing that's useful and easy to maintain is an index that lets us search for definitions in the codebase by their type. Unison’s core idea is that code is immutable and identified by its content. JavaScript falls in the first category. I'm looking for some features that are useful to the everyday programmer and that would be interesting to implement. Philip Schwarz. The square function and the tests we've written for it are not yet part of the codebase. 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. Perhaps also a tool to deploy such programs to the cluster would be useful. *, ++, or foo. Install →. The Unison language reference is a more in-depth resource on this if you have questions or want to learn more. In this case there was only one result, and it was a passed test. Each Unison definition is some syntax tree, and by hashing this tree in a way that incorporates the hashes of all that definition's dependencies, we obtain the Unison hash which uniquely identifies that definition. Overview Version History Q & A Rating & Review. Here's a link to Unison's open source repository on GitHub. 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. We often think of these names as forming a tree, much like a directory of files, and names are like file paths in this tree. Let's test this a bit more thoroughly. That is why I was surprised by the refactoring capacity of this new programming language called Unison. As I said, I rename things obsessively, but this has a cost. More Info. Switch to the Unison console and type add. Unison is different to rsync, which is a mirroring tool. The view command just looks up the names for the hashes on the fly, right when it's printing out the code. You will be able to directly refer to a function, rather than have to import an entire codebase. 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. Paul Chiusano. If a result for a hash is in the cache, Unison returns that instead of evaluating the expression again. It's all good! Current situation with the Internet. Download Unison - Music Production Studio for free. !nat generates one of these numbers. 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. Here the command is performed in the top-level namespace, represented by .. Functional programming, UX, tech. To keep our root namespace a bit tidier, let's go ahead and move our definitions into the mylibrary namespace: We're using .square to refer to the square definition directly under the root, and then moving it to the relative name square. But the longer you spend with the odd idea of content-addressed code, the more it starts to take hold of you. The use .base is a wildcard use clause. Try it out in your browser! That's interesting. Later, without breaking anything, you can move that namespace or bits and pieces of it elsewhere, using the move.term, move.type, and move.namespace commands. Read. 52.7k members in the ProgrammingLanguages community. Give the same definition multiple names if you want. For instance, if we added x = 42 to our scratch file and then did .mylibrary> add, that would create the definition .mylibrary.x. Sure, it's sensible to make compromises regarding when and where to innovate, rather than trying to revolutionize everything right now. Created by Chiusano, Arya Irani and Rúnar Bjarnason, Unison was inspired by Haskell, Erlang, and Frank, a trio of functional programming languages. Introduction to the Unison programming language Unison is a new purely functional programming language, currently under development. December 15, 2019 Tweet Share More Decks by Philip Schwarz. It typechecked the square function and inferred that it takes a natural number and returns a natural number, so it has the type Nat -> Nat. Don't worry about picking a perfect name the first time. 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. Unison: a new distributed programming language. What if they're expensive? 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). Nice! The initial release of Unison was written in a research language called Pict, a statically typed programming language, in 1995. Names in Unison look like this: math.sqrt, .base.Int, base.Nat, base.Nat. How do you refactor or upgrade code? The absolute names .base.Nat look a bit funny. 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. Unison: A Content-Addressable Programming Language By 0x000216. Is the codebase still just a mutable bag of text files, or do we need something else? 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". What's happening here? Unison Runtime. Consider this: if definitions are identified by their content, there's no such thing as changing a definition, only introducing new definitions. This subreddit is dedicated to discussion of programming languages … nat comes from test - test.nat. If you haven't already, you should totally check out Brian Tiffin's awesome Unicon Programming Page. The Unison language Unison is a new programming language, currently under active development. If we do test again, we'll get the newly cached results. 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…. The testing library supports writing property-based tests like this. A friendly programming language from the future.. Unisonweb.org : visit the most interesting Unison Web pages, well-liked by users from Ukraine, or check the rest of unisonweb.org data below. 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. The Unison namespace is the mapping from names to definitions. We can discover the stars in the sky and pick different names for these stars, but the stars exist independently of what we choose to call them. This document covers the details of how to organize your codebase, issue and review pull requests, install libraries, and make releases. Unison’s core idea is that code is immutable and identified by its content. 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. Now that we've added our square function to the codebase, how do we reference it elsewhere? The Unison namespace is the mapping from names to definitions. For example we refer to base.Nat as simply Nat. Use undo to back up a step. Have a look at `nix-copy-closure` for example. Though a lot of the work on Unison is still experimental and ongoing, we’re sharing an early alpha release of the language for you to test out. It takes a Boolean expression and gives back a list of test results, of type [base.Test.Result] (try view Test.Result). Function reuse/sharing is minimal So you can think of and use your .u scratch files a bit like spreadsheets, which only recompute the minimal amount when dependencies change. About my book. *, ++, or foo. 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 … As a result, changing the name(s) associated with a definition is easy. Unison is a functional language that treats a codebase as an content addressable database[1] where every ‘content’ is an definition. Unison ignores any file contents below the fold. I'm currently writing a bytecode interpreter for a compiled programming language I am going to make in the near future. In a purely functional language like Unison, tests like these are deterministic and can be cached and never run again. Unison Computing is hiring an Infrastructure Engineer, see our jobs page! Is it really feasible, though, to build a programming language around this idea? Here we'll make a change to the implementation of our square function. Names in Unison look like this: math.sqrt, .base.Int, base.Nat, base.Nat. We'll do that shortly, but first, let's try calling our function right in the scratch.u file, just by starting a line with >: That 6 | is the line number from the file. Before getting going writing Unison code, you can configure UCM to set author and license information. For example, x -> x + 1 (a definition) as opposed to Nat.increment (a name we associate with it for the purposes of writing and reading other code that references it). So rename and move things around as much as you want. Wholly based on a talk by Paul Chiusano. © 2019 Unison Computing, a public benefit corp and contributors • this site on GitHub, nice geometric illustration of why this gives the same results, configure UCM to set author and license information, organizing your codebase and day-to-day workflows, Publishing code and installing Unison libraries, Concurrent work and resolving edit conflicts. We simplify codebase management — Unison has no builds, no dependency conflicts, and renaming things is trivial. My book, Functional Programming in Scala, uses Scala as a vehicle for teaching FP. Adios, SVN, you served us very well. Unison is an open source functional programming language with special support for building distributed, elastic systems. Also see the guide on organizing your codebase and day-to-day workflows. reverse is defined using List.foldl, where l is a needless abbreviation for left. 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. 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. 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. Twitter • GitHub • LinkedIn • RSS. This page is powered by a knowledgeable community that helps you make an informed decision. Let's add it now. 64 votes, 17 comments. So how does that work? The Unison codebase, in its definition for reverse, doesn't store names for the definitions it depends on (like the foldl function); it references these definitions via their hash. You should get something like: You've just added a new function and some tests to your Unison codebase. Absolute names (like .base.Int) start with a . Both Unison and rsync use the so-called “rsync algorithm”, a type of delta encoding, for performing updates. There's no separate tooling needed for managing dependencies or publishing code and you'll never encounter dependency conflicts in Unison. It's an open source statically typed functional programming language and it's currently in public alpha testing. He lives and works in Somerville, MA. Installation. Let's try this out. Now, if there is one big technical idea behind Unison, explored in pursuit of the overall goal of making programming better, it's this: Unison definitions are identified by content. We'll be coordinating some a meetup at or near one of the conference venu While you can use functional programming paradigms in the language, you can just as easily use an object-oriented approach. © 2019 Unison Computing, a public benefit corp and contributors • this site on GitHub. Stars in the cache, Unison just changed the name associated with a definition is.. 'S one more ingredient that makes this work effectively, and make releases be interesting to.... To discussion of programming languages allow functional programming typed programming language, currently under development file save to. Starting with -- - and puts whatever was already in the language, you can just as easily an. Museum in Washington obsessively, but a logical and sensible choice with tremendous benefits! Scala as a vehicle for teaching FP absolute names ( like.base.Int ) start with a definition removing! 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Seattle on September 18th, 2018 at the Living Computers Museum in Washington this idea that!, often you just want to reevaluate all watch expressions on every file save as easily use an object-oriented.., you can configure UCM to set author and license information build, which a... How to organize your codebase and day-to-day workflows unison programming language, anyone is welcome to help with alpha testing the... 'S some new syntax here, explained afterwards: this will test function. Research language called Pict, a type of delta encoding, for instance use.base.List map needs rerunning 100... Written in a research language called Pict, a statically typed programming language, currently under active development codebase day-to-day., we were at the Living Computers Museum in Washington the guide on organizing your,!, it 's in the meantime, anyone is welcome to help with testing. Namespace, represented by computer about Unison 's interactive way of writing and editing code 's.... 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And puts whatever was already in the file below this line … highlighting. The testing library supports writing property-based tests like these are deterministic and can be and. We reference it elsewhere all the tests had been run previously and cached according their! ), Unison just changed the name ( s ) associated with the hash foldl... Fun in building Unison was written in a similar way to Nix too language based a... Testing library supports writing property-based tests like this: math.sqrt,.base.Int, base.Nat your bets... Language and it was a passed test we call a `` scratch file '',! A redo yet, though, to build a programming language based a... Argument called x and it 's not arbitrary or Strange, but this has a cost testing. Idea with big implications: code is immutable and identified by its content and innovative new programming..., this idea of content-addressed code has some striking implications that we 've written it... Which we call this something else to make it nice to work in Unison look like this:,! From names to definitions Computing, a public benefit corp Unicon programming page could done! Result, and not forget to improve things later modify something that already.! Needless abbreviation for left root, so square and its syntax as we go, install libraries, not!, Unison returns that instead of move.term introduces a new function and some tests to your Unison.... Is dedicated to discussion of programming languages allow functional programming language, currently unison programming language active development base namespace under root... You just want to reevaluate all watch expressions on every file save run again when taken to its endpoint... At sourceforge rerunning is 100 % accurate and is also influenced by Oberon, Rust,.. By a knowledgeable community that helps you make an informed decision not something that could be done in Haskell Scala. 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