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OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toENGINEERING BLOG
Markov chain Monte Carlo Sampling (1) In this first post of Tweag's four-part series on Markov chain Monte Carlo sampling algorithms, you will learn about why and when to use them and the theoretical underpinnings of this powerful class of sampling methods. We discuss the famous Metropolis-Hastings algorithm and give an intuition on thechoice
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Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
SIMULATING TENDERBAKE Simulating Tenderbake - Tweag. This is a repost of this blog post originally published on the Nomadic Labs blog. The consensus algorithm is a crucial part of any blockchain project. Because of the distributed nature of blockchains, different nodes can have different ideas of what the current state of the blockchain is supposed to be. NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use HOW TO BUILD HYBRID HASKELL AND JAVA PROGRAMS LINEAR-BASE MAKES WRITING LINEAR HASKELL EASY AND FUN linear-base makes writing Linear Haskell easy and fun - Tweag. We’re announcing linear-base , a standard library for Linear Haskell programs. Our release accompanies the release of GHC 9.0 which supports -XLinearTypes. Linear base has been written by Bhavik Mehta, a former Tweag intern, Arnaud Spiwack, and ourselves. ARROWS, THROUGH A DIFFERENT LENS Arrows, through a different lens - Tweag. Our previous posts on computational pipelines, such as those introducing Funflow and Porcupine, show that Arrows are very useful for data science workflows. They allow the construction of effectful and composable pipelines whose structure is known at compile time, which is not possible when using Monad s. TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. SOFTWARE INNOVATION LAB Minimize risk with high-assurance software, from blockchain to trading systems. Put safety first with robust and reliable software, backed by static analysis. At Tweag, we drive purposeful innovation through lasting software. We apply mathematics, computer science and the methods of open source to advance software engineering.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toENGINEERING BLOG
Markov chain Monte Carlo Sampling (1) In this first post of Tweag's four-part series on Markov chain Monte Carlo sampling algorithms, you will learn about why and when to use them and the theoretical underpinnings of this powerful class of sampling methods. We discuss the famous Metropolis-Hastings algorithm and give an intuition on thechoice
CONTACT US.
Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
SIMULATING TENDERBAKE Simulating Tenderbake - Tweag. This is a repost of this blog post originally published on the Nomadic Labs blog. The consensus algorithm is a crucial part of any blockchain project. Because of the distributed nature of blockchains, different nodes can have different ideas of what the current state of the blockchain is supposed to be. NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use HOW TO BUILD HYBRID HASKELL AND JAVA PROGRAMS LINEAR-BASE MAKES WRITING LINEAR HASKELL EASY AND FUN linear-base makes writing Linear Haskell easy and fun - Tweag. We’re announcing linear-base , a standard library for Linear Haskell programs. Our release accompanies the release of GHC 9.0 which supports -XLinearTypes. Linear base has been written by Bhavik Mehta, a former Tweag intern, Arnaud Spiwack, and ourselves. ARROWS, THROUGH A DIFFERENT LENS Arrows, through a different lens - Tweag. Our previous posts on computational pipelines, such as those introducing Funflow and Porcupine, show that Arrows are very useful for data science workflows. They allow the construction of effectful and composable pipelines whose structure is known at compile time, which is not possible when using Monad s. TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toENGINEERING BLOG
Markov chain Monte Carlo Sampling (1) In this first post of Tweag's four-part series on Markov chain Monte Carlo sampling algorithms, you will learn about why and when to use them and the theoretical underpinnings of this powerful class of sampling methods. We discuss the famous Metropolis-Hastings algorithm and give an intuition on thechoice
NIX FLAKES, PART 3: MANAGING NIXOS SYSTEMS This is the third in a series of blog posts about Nix flakes.The first part motivated why we developed flakes — to improve Nix’s reproducibility, composability and usability — and gave a short tutorial on how to use flakes. The second part showed how flakes enable reliable caching of Nix evaluation results. In this post, we show how flakes can be used to manage NixOS systems in a MAPPING A UNIVERSE OF OPEN SOURCE SOFTWARE The repositories of distributions such as Debian and Nixpkgs are among the largest collections of open source (and some unfree) software. They are complex systems that connect and organize many interdependent packages. In this blog post I'll try to shed some light on them from the perspective of Nixpkgs, mostly with visualizations of its completedependency graph.
TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. TRUSTIX: DISTRIBUTED TRUST AND REPRODUCIBILITY TRACKING 16 December 2020 — by Adam Hoese. Trustix: Distributed trust and reproducibility tracking for binary caches. nix. Downloading binaries from well-known providers is the easiest way to install new software. After all, building software from source is a chore — A TALE OF TEMPLATE HASKELL AND CROSS COMPILATION A tale of Template Haskell and cross compilation - Tweag. 25 November 2020 — by Cheng Shao, Georgios Karachalias. A tale of Template Haskell and cross compilation. haskell asterius. Template Haskell (TH) is a widely used yet controversial language extension. You have probably used it in your own code; with a single line of splice code,you
TWEAG - INTERN OPENING TO IMPROVE GHC PERFORMANCE Tweag - Intern opening to improve GHC performance. Haskell’s GHC compiler has notoriously slow compile times. In a bid to drive the change it seeks in the world, Tweag is opening a call for applications for an intern to work for three months solely on improving GHC’s performance. This post describes a number of approaches the internmight take.
JAVA FROM HASKELL: A TUTORIAL The type family Interp a stands for the Java type that corresponds to the Haskell type a.A value of type J (Interp a) is a reference to a Java object of type Interp a.With reify we can convert a Java object to a Haskell value. With reflect we can convert a Haskell value back into a Java object. As with the type class Coercible, the package jvm already provides a few instances of Reify and Reflect. HASKELL WEBASSEMBLY CALLING JAVASCRIPT AND BACK AGAIN Continuing with the above example, in order to call mult_hs in JavaScript, the callback that we need to supply would be: i => { i. wasmInstance. exports.hs_init(); console.log( i. wasmInstance. exports.mult_hs(6, 7)); } i.wasmInstance is the instantiated WebAssembly.Instance. We call i.wasmInstance.exports.hs_init () to initialise the runtime SOFTWARE INNOVATION LAB Minimize risk with high-assurance software, from blockchain to trading systems. Put safety first with robust and reliable software, backed by static analysis. At Tweag, we drive purposeful innovation through lasting software. We apply mathematics, computer science and the methods of open source to advance software engineering.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toCONTACT US.
Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
MAPPING A UNIVERSE OF OPEN SOURCE SOFTWARE The repositories of distributions such as Debian and Nixpkgs are among the largest collections of open source (and some unfree) software. They are complex systems that connect and organize many interdependent packages. In this blog post I'll try to shed some light on them from the perspective of Nixpkgs, mostly with visualizations of its completedependency graph.
NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use NIX FLAKES, PART 3: MANAGING NIXOS SYSTEMS This is the third in a series of blog posts about Nix flakes.The first part motivated why we developed flakes — to improve Nix’s reproducibility, composability and usability — and gave a short tutorial on how to use flakes. The second part showed how flakes enable reliable caching of Nix evaluation results. In this post, we show how flakes can be used to manage NixOS systems in a A TALE OF TEMPLATE HASKELL AND CROSS COMPILATION Tweag - A tale of Template Haskell and cross compilation. 25 November 2020 — by Cheng Shao, Georgios Karachalias. A tale of Template Haskell and cross compilation. haskell asterius. Template Haskell (TH) is a widely used yet controversial language extension. You have probably used it in your own code; with a single line of splice code,you
TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. FUNFLOW: TYPED RESUMABLE WORKFLOWS SECURELY STORING SECRETS IN TERRAFORM WITH TERRAFORM I want to present you a Terraform plugin for securely managing secrets that was written for Digital Asset, who kindly allowed me to open source it.The general idea of this plugin is to protect secrets by making use of Terraform’s state.. Terraform maintains the state of the world at the moment of a deployment in state files.In the case of multi-seat deployments, where several people work SOFTWARE INNOVATION LAB Minimize risk with high-assurance software, from blockchain to trading systems. Put safety first with robust and reliable software, backed by static analysis. At Tweag, we drive purposeful innovation through lasting software. We apply mathematics, computer science and the methods of open source to advance software engineering.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toCONTACT US.
Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
MAPPING A UNIVERSE OF OPEN SOURCE SOFTWARE The repositories of distributions such as Debian and Nixpkgs are among the largest collections of open source (and some unfree) software. They are complex systems that connect and organize many interdependent packages. In this blog post I'll try to shed some light on them from the perspective of Nixpkgs, mostly with visualizations of its completedependency graph.
NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use NIX FLAKES, PART 3: MANAGING NIXOS SYSTEMS This is the third in a series of blog posts about Nix flakes.The first part motivated why we developed flakes — to improve Nix’s reproducibility, composability and usability — and gave a short tutorial on how to use flakes. The second part showed how flakes enable reliable caching of Nix evaluation results. In this post, we show how flakes can be used to manage NixOS systems in a A TALE OF TEMPLATE HASKELL AND CROSS COMPILATION Tweag - A tale of Template Haskell and cross compilation. 25 November 2020 — by Cheng Shao, Georgios Karachalias. A tale of Template Haskell and cross compilation. haskell asterius. Template Haskell (TH) is a widely used yet controversial language extension. You have probably used it in your own code; with a single line of splice code,you
TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. FUNFLOW: TYPED RESUMABLE WORKFLOWS SECURELY STORING SECRETS IN TERRAFORM WITH TERRAFORM I want to present you a Terraform plugin for securely managing secrets that was written for Digital Asset, who kindly allowed me to open source it.The general idea of this plugin is to protect secrets by making use of Terraform’s state.. Terraform maintains the state of the world at the moment of a deployment in state files.In the case of multi-seat deployments, where several people work NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use SIMULATING TENDERBAKE Let’s go over the arguments of the function: Algorithm.params is the parameters of the algorithm such as e.g. round duration in seconds.; Time.t is the current time.; Event.t is the event the node needs to react to. Currently there are two kinds of events: reception of a message and a “wake up” call that the node can schedule foritself.
AD-HOC INTERPRETERS WITH CAPABILITY The capability library is an alternative to the venerable mtl (see our earlier blog posts on the subject). It features a set of “mtl-style” type classes, representing effects, along with deriving combinators to define interpreters as type class instances.It relies on the -XDerivingVia extension to discharge effects declaratively, close to the definition of the application’s monad. TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS.ORMOLU INTERNSHIP
There are various issues affecting Ormolu, and fixing these would have a positive impact on the user experience. The internship would address them in severity order: Upgrading the GHC parser. Presently, Ormolu uses ghc-lib-parser. GHC 9.0 fixes some long-standing issues, and we can take advantage of that by switching to ghc-lib-parser-9.0.1.xxx. LINEAR-BASE MAKES WRITING LINEAR HASKELL EASY AND FUN linear-base makes writing Linear Haskell easy and fun - Tweag. We’re announcing linear-base , a standard library for Linear Haskell programs. Our release accompanies the release of GHC 9.0 which supports -XLinearTypes. Linear base has been written by Bhavik Mehta, a former Tweag intern, Arnaud Spiwack, and ourselves. ARROWS, THROUGH A DIFFERENT LENS Arrows, through a different lens - Tweag. Our previous posts on computational pipelines, such as those introducing Funflow and Porcupine, show that Arrows are very useful for data science workflows. They allow the construction of effectful and composable pipelines whose structure is known at compile time, which is not possible when using Monad s. JAVA FROM HASKELL: A TUTORIAL The type family Interp a stands for the Java type that corresponds to the Haskell type a.A value of type J (Interp a) is a reference to a Java object of type Interp a.With reify we can convert a Java object to a Haskell value. With reflect we can convert a Haskell value back into a Java object. As with the type class Coercible, the package jvm already provides a few instances of Reify and Reflect. FUNFLOW: TYPED RESUMABLE WORKFLOWS Funflow’s workflows are just Haskell programs, built using arrow syntax. With Funflow, we can easily intermix steps done inside our Haskell process and steps done outside, for example by another program. Arrows give us, (the generality to model multiple types of computation) a function a -> b is an arrow, as is a monadic functionMonad m => a
LINEAR TYPES MAKE PERFORMANCE MORE PREDICTABLE 13 March 2017 — by Jean-Philippe Bernardy and Arnaud Spiwack. Linear types make performance more predictable. haskell linear-types. We’re extending GHC with linear types. Ever since Jean-Yves Girard discovered linear logic in 1986, researchers around the world have been going “wow! resource tracking, this must be useful forprogramming
SOFTWARE INNOVATION LAB Minimize risk with high-assurance software, from blockchain to trading systems. Put safety first with robust and reliable software, backed by static analysis. At Tweag, we drive purposeful innovation through lasting software. We apply mathematics, computer science and the methods of open source to advance software engineering.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toCONTACT US.
Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
MAPPING A UNIVERSE OF OPEN SOURCE SOFTWARE The repositories of distributions such as Debian and Nixpkgs are among the largest collections of open source (and some unfree) software. They are complex systems that connect and organize many interdependent packages. In this blog post I'll try to shed some light on them from the perspective of Nixpkgs, mostly with visualizations of its completedependency graph.
NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use NIX FLAKES, PART 3: MANAGING NIXOS SYSTEMS This is the third in a series of blog posts about Nix flakes.The first part motivated why we developed flakes — to improve Nix’s reproducibility, composability and usability — and gave a short tutorial on how to use flakes. The second part showed how flakes enable reliable caching of Nix evaluation results. In this post, we show how flakes can be used to manage NixOS systems in a A TALE OF TEMPLATE HASKELL AND CROSS COMPILATION Tweag - A tale of Template Haskell and cross compilation. 25 November 2020 — by Cheng Shao, Georgios Karachalias. A tale of Template Haskell and cross compilation. haskell asterius. Template Haskell (TH) is a widely used yet controversial language extension. You have probably used it in your own code; with a single line of splice code,you
TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. FUNFLOW: TYPED RESUMABLE WORKFLOWS SECURELY STORING SECRETS IN TERRAFORM WITH TERRAFORMHOW TO RUN TERRAFORMLEARN TERRAFORMTERRAFORM SECRETS AZURETERRAFORM SECRETS MANAGERTERRAFORM SECRETS MANAGER RESOURCE I want to present you a Terraform plugin for securely managing secrets that was written for Digital Asset, who kindly allowed me to open source it.The general idea of this plugin is to protect secrets by making use of Terraform’s state.. Terraform maintains the state of the world at the moment of a deployment in state files.In the case of multi-seat deployments, where several people work SOFTWARE INNOVATION LAB Minimize risk with high-assurance software, from blockchain to trading systems. Put safety first with robust and reliable software, backed by static analysis. At Tweag, we drive purposeful innovation through lasting software. We apply mathematics, computer science and the methods of open source to advance software engineering.OUR SERVICES
Services. Tweag translates ambitious visions into technology solutions that work. We combine solid engineering principles with new ideas from academia to solve complex problems and build critical systems. We take on your project as our own. Our engineers embed into your team, injecting experience and technical expertise from proof-of-concept toCONTACT US.
Contact us. Email*. Send message. Or send a direct email to our team hello@tweag.io. Paris. EURL Tweag. 207 Rue de Bercy. 75012 Paris.France.
MAPPING A UNIVERSE OF OPEN SOURCE SOFTWARE The repositories of distributions such as Debian and Nixpkgs are among the largest collections of open source (and some unfree) software. They are complex systems that connect and organize many interdependent packages. In this blog post I'll try to shed some light on them from the perspective of Nixpkgs, mostly with visualizations of its completedependency graph.
NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use NIX FLAKES, PART 3: MANAGING NIXOS SYSTEMS This is the third in a series of blog posts about Nix flakes.The first part motivated why we developed flakes — to improve Nix’s reproducibility, composability and usability — and gave a short tutorial on how to use flakes. The second part showed how flakes enable reliable caching of Nix evaluation results. In this post, we show how flakes can be used to manage NixOS systems in a A TALE OF TEMPLATE HASKELL AND CROSS COMPILATION Tweag - A tale of Template Haskell and cross compilation. 25 November 2020 — by Cheng Shao, Georgios Karachalias. A tale of Template Haskell and cross compilation. haskell asterius. Template Haskell (TH) is a widely used yet controversial language extension. You have probably used it in your own code; with a single line of splice code,you
TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS. FUNFLOW: TYPED RESUMABLE WORKFLOWS SECURELY STORING SECRETS IN TERRAFORM WITH TERRAFORMHOW TO RUN TERRAFORMLEARN TERRAFORMTERRAFORM SECRETS AZURETERRAFORM SECRETS MANAGERTERRAFORM SECRETS MANAGER RESOURCE I want to present you a Terraform plugin for securely managing secrets that was written for Digital Asset, who kindly allowed me to open source it.The general idea of this plugin is to protect secrets by making use of Terraform’s state.. Terraform maintains the state of the world at the moment of a deployment in state files.In the case of multi-seat deployments, where several people work NIX FLAKES, PART 1: AN INTRODUCTION AND TUTORIAL Nix Flakes, Part 1: An introduction and tutorial - Tweag. This is the first in a series of blog posts intended to provide a gentle introduction to flakes, a new Nix feature that improves reproducibility, composability and usability in the Nix ecosystem. This blog post describes why flakes were introduced, and give a short tutorial on how to use SIMULATING TENDERBAKE Let’s go over the arguments of the function: Algorithm.params is the parameters of the algorithm such as e.g. round duration in seconds.; Time.t is the current time.; Event.t is the event the node needs to react to. Currently there are two kinds of events: reception of a message and a “wake up” call that the node can schedule foritself.
AD-HOC INTERPRETERS WITH CAPABILITY The capability library is an alternative to the venerable mtl (see our earlier blog posts on the subject). It features a set of “mtl-style” type classes, representing effects, along with deriving combinators to define interpreters as type class instances.It relies on the -XDerivingVia extension to discharge effects declaratively, close to the definition of the application’s monad. TWEAG - CONFIGURING AND TESTING KUBERNETES CLUSTERS WITH 7 March 2019 — by Tobias Pflug. Configuring and testing Kubernetes clusters with KubeNix and kind. nix devops. In a recent project I was tasked with creating a local testing environment for a Kubernetes cluster the client was actively working on. The main requirements were: Cross platform: It should work on Linux and macOS.ORMOLU INTERNSHIP
There are various issues affecting Ormolu, and fixing these would have a positive impact on the user experience. The internship would address them in severity order: Upgrading the GHC parser. Presently, Ormolu uses ghc-lib-parser. GHC 9.0 fixes some long-standing issues, and we can take advantage of that by switching to ghc-lib-parser-9.0.1.xxx. LINEAR-BASE MAKES WRITING LINEAR HASKELL EASY AND FUN linear-base makes writing Linear Haskell easy and fun - Tweag. We’re announcing linear-base , a standard library for Linear Haskell programs. Our release accompanies the release of GHC 9.0 which supports -XLinearTypes. Linear base has been written by Bhavik Mehta, a former Tweag intern, Arnaud Spiwack, and ourselves. ARROWS, THROUGH A DIFFERENT LENS Arrows, through a different lens - Tweag. Our previous posts on computational pipelines, such as those introducing Funflow and Porcupine, show that Arrows are very useful for data science workflows. They allow the construction of effectful and composable pipelines whose structure is known at compile time, which is not possible when using Monad s. JAVA FROM HASKELL: A TUTORIAL The type family Interp a stands for the Java type that corresponds to the Haskell type a.A value of type J (Interp a) is a reference to a Java object of type Interp a.With reify we can convert a Java object to a Haskell value. With reflect we can convert a Haskell value back into a Java object. As with the type class Coercible, the package jvm already provides a few instances of Reify and Reflect. FUNFLOW: TYPED RESUMABLE WORKFLOWS Funflow’s workflows are just Haskell programs, built using arrow syntax. With Funflow, we can easily intermix steps done inside our Haskell process and steps done outside, for example by another program. Arrows give us, (the generality to model multiple types of computation) a function a -> b is an arrow, as is a monadic functionMonad m => a
LINEAR TYPES MAKE PERFORMANCE MORE PREDICTABLE 13 March 2017 — by Jean-Philippe Bernardy and Arnaud Spiwack. Linear types make performance more predictable. haskell linear-types. We’re extending GHC with linear types. Ever since Jean-Yves Girard discovered linear logic in 1986, researchers around the world have been going “wow! resource tracking, this must be useful forprogramming
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We use functional programming to build apps and services from the ground up as composable, interchangeable, permutable atoms and molecules. Don't keep whole programs in your head: zoom in on any piece and reason about rich behaviours locally. Stack them, pipeline them, connect them in a loop to build rich behaviours from simpleparts.
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We use functional programming to build apps and services from the ground up as composable, interchangeable, permutable atoms and molecules. Don't keep whole programs in your head: zoom in on any piece and reason about rich behaviours locally. Stack them, pipeline them, connect them in a loop to build rich behaviours from simpleparts.
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