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

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