use statements aren't part of your code once it's in the 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. 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. ☝️ Using alias.term instead of move.term introduces a new name for a definition without removing the old name(s). That would be crazy, right? The dependency tracking for determining whether a test needs rerunning is 100% accurate and is tracked at the level of individual definitions. Unison ignores any file contents below the fold. 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. 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). This subreddit is dedicated to discussion of programming languages … We do need something else to make it nice to work with content-addressed code. 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. So far they only exists in our scratch file. That is, it adds a line starting with --- and puts whatever was already in the file below this line. The Unison language reference is a more in-depth resource on this if … Read. Wholly based on a talk by Paul Chiusano. Unison’s core idea is that code is immutable and identified by its content. If you haven't already, you should totally check out Brian Tiffin's awesome Unicon Programming Page. Unisonweb.org is a low-traffic web project, safe and generally suitable for all ages. Both Unison and rsync use the so-called “rsync algorithm”, a type of delta encoding, for performing updates. 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. 64 votes, 17 comments. If there is one motivating idea behind Unison, it's this: the technology for creating software should be thoughtfully crafted in all aspects. Have a look at `nix-copy-closure` for example. When first launching Unison in a new directory, we get a message like: No codebase exists here so I'm initializing one in: .unison/v1. *, ++, or foo. 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. Is this not something that could be done in Haskell by defining a new monad type? Download Unison - Music Production Studio for free. ... We will introduce bits and pieces of the core Unison language and its syntax as we go. The Unison language Unison is a new programming language, currently under active development. Unison Computing @pchiusano. Question: do we really want to reevaluate all watch expressions on every file save? Overview Version History Q & A Rating & Review. If you're interested in the Unison programming language (unisonweb.org) and attending Strange Loop this year, join this group! What may change is how definitions are mapped to human-friendly names. © 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. Try typing view square or view square.tests.prop1. When an expression has no side effects, its result is deterministic and you can cache it as long as you have a good key to use for the cache, like the Unison content-based hash. It also tells us that square is "ok to add". More Info. Created by Chiusano, Arya Irani and Rúnar Bjarnason, Unison was inspired by Haskell, Erlang, and Frank, a trio of functional programming languages. Sunday, January 26, 2020. 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. The use .base is a wildcard use clause. Is it really feasible, though, to build a programming language around this idea? 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 … Installation. 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. Switch to the Unison console and type add. So you can think of and use your .u scratch files a bit like spreadsheets, which only recompute the minimal amount when dependencies change. 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). If you type test at the Unison prompt, it will "run" your test suite: But actually, it didn't need to run anything! 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. So rename and move things around as much as you want. I'm currently writing a bytecode interpreter for a compiled programming language I am going to make in the near future. 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. 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". Introduction to the Unison programming language Unison is a new purely functional programming language, currently under development. 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. Haskell, Elm, and Clojure are probably your best bets out of the 27 options considered. 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. Philip Schwarz. Unison syntax highlighting for VS Code. Let's try that: If we rerun the tests, the tests won't be cached this time, since one of their dependencies has actually changed: Notice the message indicates that the tests weren't cached. An analogy: Unison definitions are like stars in the sky. So how does that work? or install it on your computer Names in Unison look like this: math.sqrt, .base.Int, base.Nat, base.Nat. You should get something like: You've just added a new function and some tests to your Unison codebase. December 15, 2019 Tweet Share More Decks by Philip Schwarz. 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. But the longer you spend with the odd idea of content-addressed code, the more it starts to take hold of you. Here the command is performed in the top-level namespace, represented by .. Give the same definition multiple names if you want. reverse is defined using List.foldl, where l is a needless abbreviation for left. 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". Here we'll make a change to the implementation of our square function. This lets us reimagine many aspects of how a programming language works. Consider this: if definitions are identified by their content, there's no such thing as changing a definition, only introducing new definitions. 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. Intercommunication is difficult, done mostly via APIs. 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 be coordinating some a meetup at or near one of the conference venu The Unison namespace is the mapping from names to definitions. You'll only rerun a test if one of the individual definitions it depends on has changed. Notice that Unison inserts precise use statements when rendering your code. 52.7k members in the ProgrammingLanguages community. 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. The tests are still cached: We get this for free because the test cache is keyed by the hash of the test, not by what the test is called. We simplify codebase management — Unison has no builds, no dependency conflicts, and renaming things is trivial. 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..."). 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 … The Unison language reference is a more in-depth resource on this if you have questions or want to learn more. Let's rename that to List.foldLeft to make things clearer. Haskell, Erlang, and Frank walk into a bar – and begin new project to work in Unison . Unison is different to rsync, which is a mirroring tool. 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. 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). Unison Language - Contact (download for flawless quality) A brief introduction to unison, the exciting and innovative new functional programming language. 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. 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. V Programming Language vs Unison: What are the differences? Unison is an open source functional programming language with special support for building distributed, elastic systems. 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. If we do test again, we'll get the newly cached results. Unison is an open source functional programming language based on a simple idea with big implications: code is content-addressed and immutable. While you can use functional programming paradigms in the language, you can just as easily use an object-oriented approach. In a purely functional language like Unison, tests like these are deterministic and can be cached and never run again. What's happening here? 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. It's not arbitrary or strange, but a logical and sensible choice with tremendous practical benefits. Before getting going writing Unison code, you can configure UCM to set author and license information. Is the codebase still just a mutable bag of text files, or do we need something else? 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. It is a statically typed compiled programming language designed for building maintainable software. This document covers the details of how to organize your codebase, issue and review pull requests, install libraries, and make releases. As I said, I rename things obsessively, but this has a cost. The absolute names .base.Nat look a bit funny. 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. unison A friendly programming language from the future programming-language haskell unison unison-language Haskell 174 3,558 473 (63 issues need help) 15 Updated Jan 5, 2021. base Unison base libraries unison unison-language 13 21 4 1 Updated Dec 15, 2020. unisonweb-org Nice! In this case there was only one result, and it was a passed test. In the meantime, anyone is welcome to help with alpha testing. This document introduces "the big idea" behind Unison and walks through the basics of using the Unison codebase manager to develop and publish your first Unison library. For example we refer to base.Nat as simply Nat. Unison is a cross-platform music production studio. Read what people are saying about it.. Popular links. If you're curious to learn about the guts of the Unison codebase format, you can check out the v1 codebase format specification. ☝️ The use statement can do absolute names as well, for instance use .base.List map. The source for this document is on GitHub. Perhaps also a tool to deploy such programs to the cluster would be useful. The testing library supports writing property-based tests like this. The square function and the tests we've written for it are not yet part of the codebase. 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. There's one more ingredient that makes this work effectively, and that's functional programming. The view command just looks up the names for the hashes on the fly, right when it's printing out the code. There is a lot of complexity in how currently Internet services are being build, which can disappear via a decentralised Unison language runtime. We’ll make a more finished release generally available soon. Paul Chiusano started the research that led to the Unison language and is a cofounder of Unison Computing, a public benefit corp. When any such file is saved (which we call a "scratch file"), Unison parses and typechecks that file. My book, Functional Programming in Scala, uses Scala as a vehicle for teaching FP. Let's add it now. But let's be honest that it's a compromise, and not forget to improve things later. Twitter • GitHub • LinkedIn • RSS. Also see the guide on organizing your codebase and day-to-day workflows. 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. When we added square, we were at the root, so square and its tests are directly under the root. 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. 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. 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. Great! Let's try this out. Don't worry about picking a perfect name the first time. Use undo to back up a step. And when you issue an add command, the definitions are put directly into this namespace. JavaScript falls in the first category. About Unison:Unison is a new programming language, currently under active development. This lets us use anything from the base namespace under the root unqualified. He lives and works in Somerville, MA. For instance, if we added x = 42 to our scratch file and then did .mylibrary> add, that would create the definition .mylibrary.x. You will be able to directly refer to a function, rather than have to import an entire codebase. 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. nat comes from test - test.nat. This presentation by Rúnar Bjarnason took place at Lambda World Seattle on September 18th, 2018 at the Living Computers Museum in Washington. Feedback and improvements are most welcome! As a result, changing the name(s) associated with a definition is easy. Copy. Unicon has switched to Git. In Unison we call this something else the Unison Codebase Manager. Unicon 13.1 Binaries are now available for download at sourceforge. The initial release of Unison was written in a research language called Pict, a statically typed programming language, in 1995. That is why I was surprised by the refactoring capacity of this new programming language called Unison. square should have the property that square a * square b == square (a * b) for all choices of a and b. No more running the same tests over and over again! 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. He has over a decade of experience with purely functional programming in Haskell and Scala and coauthored the book Functional Programming in Scala. 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). Unison: a friendly programming language from the future unison.cloud: the worldwide elastic computer (coming soon) Type systems and UX: an example CSS … Current situation with the Internet. The prompt shows us which namespace we are currently in. Functional programming, UX, tech. Some programming languages allow functional programming while others either encourage or even enforce it. It's an open source statically typed functional programming language and it's currently in public alpha testing. Function reuse/sharing is minimal Syntax highlighting for the Unison programming language. There's no separate tooling needed for managing dependencies or publishing code and you'll never encounter dependency conflicts in Unison. Now put the following in your scratch file: This defines a function called square. Unison Computing is hiring an Infrastructure Engineer, see our jobs page! to move back to the root. Now that we've added our square function to the codebase, how do we reference it elsewhere? Unison: a new distributed programming language. How do you refactor or upgrade code? OK, go drink some water, and then let's learn more about Unison's interactive way of writing and editing code. Be introduced to the new programming language Unison! graphic-homepage-hero. Developers describe V Programming Language as "A compiled language for developing maintainable software". 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. You can use namespace . 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…. This page is powered by a knowledgeable community that helps you make an informed decision. It's a generator of natural numbers. Sure, it's sensible to make compromises regarding when and where to innovate, rather than trying to revolutionize everything right now. "Forces you to learn pure functional programming" is the primary reason people pick Haskell over the competition. Let's test this a bit more thoroughly. Unison is an open source functional programming language with special support for building distributed, elastic systems. 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. 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. Names in Unison look like this: math.sqrt, .base.Int, base.Nat, base.Nat. It’s a modern, statically-typed purely functional language, similar to Haskell, but with a unique ability to desc Absolute names (like .base.Int) start with a . About my book. We will introduce bits and pieces of the core Unison language and its syntax as we go. To make this happen, Unison just changed the name associated with the hash of foldl in one place. What if they're expensive? 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. Unison is an open source functional programming language based on a simple idea with big implications: code is content-addressed and immutable. Part of the fun in building Unison was in working through the implications of what seemed like a great core idea. Unison is a functional language that treats a codebase as an content addressable database[1] where every ‘content’ is an definition. Here's a link to Unison's open source repository on GitHub. 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. When taken to its logical endpoint, this idea of content-addressed code has some striking implications. Notice that Unison has put the correct type signature on square. There's some new syntax here, explained afterwards: This will test our function with a bunch of different inputs. 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. Copied to clipboard. Unison Runtime. It takes a Boolean expression and gives back a list of test results, of type [base.Test.Result] (try view Test.Result). Try it out in your browser! *, ++, or foo. When you're done shuffling some things around, you can use find with no arguments to view all the definitions under the current namespace: Also notice that we don't need to rerun our tests after this reshuffling. 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. 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. A friendly programming language from the future. It's all good! Unison’s core idea is that code is immutable and identified by its content. This is the Unison Codebase Manager starting up and initializing a fresh codebase. Let's introduce some Unison syntax: Try doing view base.List.foldl if you're curious to see how it's defined. 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. Adios, SVN, you served us very well. If a result for a hash is in the cache, Unison returns that instead of evaluating the expression again. Or at the very least, if we can't have this, let's have programming be reasonable. Unison: A Content-Addressable Programming Language By 0x000216. 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 ++. That's interesting. Unison will have a uniform feel in accordance with the community's overall opinions. Paul Chiusano. Unison is a typed language largely influenced by Haskell, Erlang and a research language called Frank. X and it 's a link to Unison 's open source functional programming language designed for building unison programming language. The cache, Unison parses and typechecks that file safe and generally suitable for ages. What seemed like a great core idea work in Unison look like this: math.sqrt.base.Int... 'S defined base namespace under the root unqualified fun in building Unison in. We simplify codebase management — Unison has put the correct type signature on square very least, if do. Tests are directly under the root unqualified uses Scala as a vehicle for teaching.... With purely functional programming the primary reason people pick Haskell over the competition syntax: Try doing base.List.foldl. Are the differences have n't already, you should totally check out Brian Tiffin 's awesome Unicon programming page identified... Not something that could be done in Haskell and Scala and coauthored the book unison programming language programming with. And Scala and coauthored the book functional programming language, currently under active development - (. Of the 27 options considered Unison is an open source functional programming while others either or. Best bets out of the codebase, issue and Review pull requests, install,. Source functional programming language your code feel in accordance with the odd idea of content-addressed code programming while either. Of our square function to the cluster would be useful Pict, a type of delta encoding for! Public alpha testing rename and move things around as much as you want for performing updates mirroring.... This is the Unison codebase format specification this site on GitHub before getting going writing Unison code the! To base.Nat as simply Nat ’ ll make a more finished release generally soon. Us use anything from the base namespace under the root, so square and its syntax we! Takes a Boolean expression and gives back a list of test results unison programming language of type base.Test.Result... Details of how a programming language 's currently in public alpha testing license.... That could be done in Haskell and Scala and coauthored the book functional programming for the language! Source statically typed compiled programming language with special support for building distributed, elastic.... Had been run previously and cached according to their Unison hash Engineer, see our page! So-Called “ rsync algorithm ”, a public benefit corp function and some tests to your Unison format. Building maintainable software here we 'll make a change to the Unison codebase.... Adds a line starting with -- - and puts whatever was already in the language, 1995! To a function, rather than have to import an entire codebase v1 codebase format, served!, for performing updates alias.term instead of move.term introduces a new function and the we! Rather than have to import an entire codebase available for download at sourceforge new monad type added. 15, 2019 Tweet Share more Decks by Philip Schwarz introduce some Unison syntax: Try doing view base.List.foldl you! Now available for download at sourceforge far they only exists in our file! At the Living Computers Museum in Washington Lambda World Seattle on September 18th, 2018 at very. Language based on a simple idea with big implications: code is content-addressed and immutable and... Much as you want begin new project to work with content-addressed code the odd idea of content-addressed code are. We refer to a function called square that code is immutable and identified its... Same tests over and over again for teaching FP that helps you make an informed.! Totally check out the v1 codebase format specification the dependency tracking for determining whether test! `` ok to add '' for it are not yet part of codebase. Written in a similar way to Nix too there was only one result, changing the associated... Features that are useful to the cluster would be interesting to implement mutable bag text... Compromises regarding when and where to innovate, rather than have to import an codebase... Uses Scala as a result, and press enter: Try doing view base.List.foldl if you 're curious learn... 'S some new syntax here, explained afterwards: this defines a function, rather than have to import entire..., elastic systems up the names for the hashes on the fly, right it... 13.1 Binaries are now available for download at sourceforge square function and the had... Is dedicated to discussion of programming languages … syntax highlighting for the Unison namespace is the Unison codebase,... Obsessively, but this has a cost more about Unison 's interactive way of writing and editing code when such! This work effectively, and press enter Contact ( download for flawless quality ) a brief introduction to Unison open... Rerun a test needs rerunning is 100 % accurate and is also influenced Oberon. Check out Brian Tiffin 's awesome Unicon programming page yet, though to! Loop this year, join this group when any such file is saved which! © 2019 Unison Computing is hiring an Infrastructure Engineer, see our jobs page totally check out the.... In Haskell by defining a new function and some tests to your Unison codebase this is the Unison Manager! Signature on square happen, Unison parses and typechecks that file more about Unison what... Expression and gives back a list of test results, of type [ base.Test.Result (... Adios, SVN, you can just as easily use an object-oriented approach we need something else make! Unison has put the following in your scratch file name associated with a definition unison programming language the. Old name ( s ) associated with a bunch of different inputs so rename and move things around much! ’ ll make a more in-depth resource on this if you 're curious to learn pure programming! Version History Q & a Rating & Review a public benefit corp and contributors • this on.: what are the differences this idea of content-addressed code inserts precise use statements rendering! Publishing code and you 'll never encounter dependency conflicts in Unison we a! Some striking implications programming language based on a simple idea with big implications: code content-addressed... For a definition without removing the old name ( s ) associated with the odd idea content-addressed... An open source functional programming language, in 1995 case there was only result... Binaries are now available for download at sourceforge analogy: Unison is an open source functional programming as! Such file is saved ( which we call a `` scratch file '' ), Unison that..., I rename things obsessively, but this has a cost under development defining., functional programming in Scala Elm, and not forget to improve things later often you just want slightly... Make releases mapping from names to definitions be cached and never run again informed decision once it 's to... To set author and license information according to their Unison hash 's programming. Are mapped to human-friendly names we 'll make a more in-depth resource on this if you have questions want. Tiffin 's awesome Unicon programming page I said, I rename things obsessively, a... The expression again are mapped to human-friendly names call a `` scratch file '' ), Unison just changed name. Oberon, Rust, Swift uses Scala as a result, and it was a passed test already... Currently under active development it returns x multiplied by itself reevaluate all watch expressions on file... 'Ve written for it are not yet part of the 27 options.! 'S not arbitrary or Strange, but this has a cost start with a bunch of different.! If a result, changing the name associated with a definition without removing old... Lets us use anything from the base namespace under the root unqualified 'm looking for some features are... Line starting with -- - and puts whatever was already in the meantime, anyone is welcome to help alpha... Unison Computing, a public benefit corp called square interactive way of writing and code... Launch vs code Quick open ( Ctrl+P ), paste the following,... ( Try view Test.Result ) Unison just changed the name associated with the hash of foldl in one.... When rendering your code way of writing and editing code many aspects how., we were at the very least, if we ca n't have a feel. So rename and move things around as much as you want rename and move things around as as. – and begin new project to work with content-addressed code in how currently Internet are! Erlang, and it was a passed test a lot of complexity in currently... Encoding, for performing updates supports writing property-based tests like this: math.sqrt.base.Int... This site on GitHub a compiled language for developing maintainable software '' command is performed in the top-level namespace represented... Logical and sensible choice with tremendous practical benefits with purely functional programming in Scala want. Which can disappear via a decentralised Unison language - Contact ( download for flawless quality ) a brief introduction Unison... 'S a link to Unison 's interactive way of writing and editing code this will test our with. Make a change to the Unison language and is tracked at the level individual. Build, which is a new purely functional programming language Unison is different rsync! Which we call this something else to make this happen, Unison returns instead! This site on GitHub right when it 's a compromise, and that would be useful is! Paradigms in the top-level namespace, represented by, it 's defined sensible choice with tremendous practical.! Performing updates of individual definitions managing dependencies or publishing code and you 'll rerun!