scala best practices

MUST use Scala's BlockContext on blocking I/O, 4.6. I can find some "best practices" for functional programming but Spark just adds an extra layer, because performance is such a major factor here. I love the idea of options, but in practice it is making my code a lot harder to read. Learn more. Learn Best Practices in Scala Programming from a professional trainer on your own time at your own desk This visual training method offers users increased retention and accelerated learning. I have surfed the internet trying to find some sort of equivalent to the best practices of the object oriented world, but without much luck. Scala Language Best Practices. Scala for the Intrigued - Duration: 1:42:04. Clean Code Best Practices in Scala Naming, functions, and TDD — these are Scala clean-code essentials. If nothing happens, download the GitHub extension for Visual Studio and try again. MUST NOT introduce spelling errors in names and comments, 2.2. @alexandru. Learn more. Our use of Scala is mainly for creating high volume services that form distributed systems — and our advice is thus biased — but most of the advice herein should translate naturally to other domains. Scala Best Practices. SHOULD use a separate thread-pool for blocking I/O, 4.7. Notwithstanding some criticism, the tagless final pattern continues to gain popularity among the Scala community. hi … A collection of best practices, friendly to people that want to I'll be developing in Scala. A collection of best practices, friendly to people that want to contribute. Scala Days Conferences 7,490 views. We use essential cookies to perform essential website functions, e.g. Preface SHOULD enforce a reasonable line length, 1.2. MUST NOT put things in Play's Global, 3.3. The criticism of "best practices" lists is that everything becomes a "core principle". In this talk at Scala Days Nicolas discusses the Scala best practices he wishes someone had told him. Prefer vals, immutable objects, and methods without side effects. Scala in Depth covers a full range of best practices and examples to help get started and solve common Scala issues. SHOULD NOT wrap purely CPU-bound operations in Futures, 4.4. SHOULD evolve the state of actors only in response to messages received from the outside, 5.2. Copyright © 2015-2016, Some Rights Reserved. Authors; Authors and affiliations; Vishal Layka; David Pollak; Chapter. SHOULD NOT declare abstract "var" members, 2.7. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. 2. For example, the following defines the myPath setting to be the /licenses/ directory. Writing code that follows these practices will serve you well beyond CS 18, because when your code is well structured and well organized, it is easier to read, debug, test, optimize, etc. Code samples demonstrate concepts along the way. Public functions SHOULD have an explicit return type, 2.17. Version: 1.2 Updated at: 2016-06-08 Table of Contents. As part of the Scala community, there are definitely some best practices we should all be aware of and some that we may not know but as Nicolas Rinaudo says once we do we will probably wish someone had told us sooner! Based on my learnings, I created a checklist of 30 best practices for creating, transmitting, and analyzing logs. By which I am suggesting that "best practices for Scala" encompasses both Scala and everything in programming. Everything except, unfortunately, the prime directive: get something working first. They’re widely used in Scala due, mostly, to how well they work with pattern matching and how easy it is to use them to make illegal states impossible to represent. This is great - being new to scala I can already see some mistakes I have made identified here and good solutions. Remarks. @maximn. Removing annoying warnings. Learn Exercises start with the basics and progress with your skill level. This short article about Scala best practices has some redundant information as above, but it also has some unique information and insights. Then I have a class used to access the different value of my properties. SHOULD NOT define case classes nested in other classes, 2.18. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. @maximn. If nothing happens, download Xcode and try again. 1. Ping me in the comments or email me if you have other suggestions for library best practices. @alexandru. If you are reading this blog there may be two reasons. Breaks even the most complex applications down into simplistic steps Comes with Extensive Working Files Solve Complete and solve exercises to test your understanding of the concepts. 0. Growing isn’t easy, but using these best practices from the beginning can make growth much smoother. MUST NOT leak the internal state of an actor in asynchronous closures. For example, I just wrote some code today that catches all Throwables. For more information, see our Privacy Statement. This is the introduction to Chapter 20, Idioms (Scala best practices). MUST serialize dates as either Unix Timestamp or ISO 8601, 2.15. I come from a Java Background where I use .properties file and load them at the start. Comments, suggestions, … are welcome! This is not helping Scala’s reputation as a hard to learn language, which is unfortunate - it’s a language I enjoy and wish more people would learn. Maxim Novak. SHOULD avoid contention on shared reads, 4.9. Something that’s becoming increasingly obvious is that Scala developers follow a certain set of unspoken rules without really thinking about them, and never really explain them to beginners. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. SHOULD mutate state in actors only with "context.become", 5.3. SHOULD NOT use Any or AnyRef or isInstanceOf / asInstanceOf, 2.13. Or, if you’re interested in a problem (exception) that occurred while processing code, you may want to return Try/Success/Failure from a method instead of Option/Some/None. A collection of Scala best practices. Collection of best practices for the Scala programming language - nrinaudo/scala-best-practices I'm creating the project from scratch and I was wondering what to do with properties. Learn, play and contribute. CSV and JSON Tips and Best Practices When persisting and compressing CSV and JSON files, make sure they are splittable, give high speeds, and yield reasonable compression. they're used to log you in. Is this also a good practice in Scala ? I’ve helped dozens of large companies set up log management solutions, and I’ve seen the best and the worst. Scala returns the last expression in a function. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. Open an issue to make suggestions, or create a pull request ;-). Scala Best Practices. People Repo info Activity. SHOULD use immutable data structures, 2.3. There are two basic categories of ADTs: 1. product types 2. sum types MUST NOT throw exceptions for validations of user input or flow control, 2.11. MUST provide a clearly defined and documented protocol for each component or actor that communicates over async boundaries, 4.10. If you see areas that could be improved on, feel free to open an issue! Coding Best practices to follow with Scala March 25, 2019 March 25, 2019 Shubham Dangare Scala Best Practices, Clean code, scala. Primitives like String, Int, Boolean are always immutable. Our talk about the Scala best practices for pattern matching would be incomplete without a solution to ignore warnings when we don't need them. Scala Good Coding Practices Spring 2020 Contents 1 Introduction This document is the CS 18 \good" coding practices guide. Scala can’t enforce immutability (yet) so this has to be by convention. Maxim Novak. You signed in with another tab or window. Scala Best Practices. Scala Best Practices. Thanks for hanging in and reading all this way. Scala best practices I wish someone'd told me about - Nicolas Rinaudo - Duration: 48:49. Scala currently infers the most specialized type possible, because in Scala the return type on functions is covariant, so you might actually get a really ugly type back SHOULD NOT define case classes nested in other classes: You should never define nested case classes inside another object/class because it messes with Java’s serialization. Compare remainder to 0 when checking for oddness, Add explicit type annotations to implicits, Avoid unicode versions of ASCII operators, Make implicit names as unique as possible, Start independent Futures outside of a for-comprehension, Do not compute the size of a collection to check for emptiness, Do not return Option from custom extractors, Add explicit type annotations to public members, Declare ADT data constructors in the companion object, Make ADTs subtypes of Product and Serializable, Declare abstract fields as paren-less methods, Use override when implementing abstract members, Creative Commons Attribution 4.0 International License. Scala Puzzlers by Andrew Phillips and Nermin Šerifović — Paid — Intermediate 2.6k Downloads; Abstract. Use this to return things over using return directly. SHOULD always prefer single producer scenarios, 4.11. hi Alexandru Nedelcu. This site is meant to address that, by listing and explaining all these rules I wish someone’d told me about when I was learning the language. I’m clearly not the best Scala developer out there and might have gotten things wrong, or right for the wrong reasons. SHOULD NOT update a "var" using loops or conditions, 2.5. Reading Time: 4 minutes. I often find myself, both professionaly and otherwise, having to explain bits of Scala to newcomers to the language (but usually not new to programming). SHOULD NOT apply optimizations without profiling, 3.4. Once you set this options and use sealed with your abstract classes for pattern matching, the Scala compiler will always stop building your project whenever a warning is produced, which is great.. MUST NOT include classes, traits and objects inside package objects, 2.19. If you’re new to Scala, start here. best practice SCALA works with our Grocery, FMCG, Home Appliance and Homeware forum member clients to ensure that, in a perpetually changing marketplace, their supply chain and logistics operations embrace the most optimal practices within the industry to … This is related to the no hard coding best practice because the proper way involves referencing the baseDirectory setting. myPath := baseDirectory.value / "licenses" In Java (and thus in Scala), a relative File is relative to the current working directory. Tagless Final in Scala: Best Practices # programming # functional # taglessfinal # scala. Licensed under CC BY 4.0. Use Git or checkout with SVN using the web URL. Anyone starting a project in Scala, expanding a Scala project, or looking to establish coding standards as a means for helping junior Scala programmers come up to speed, will value this overview of Scala best practices by Scala expert Joshua Backfield. Even more best practices from Alexandru on github Here is some good information about picking good names for classes/functions etc and clean coding. We’ve covered a lot of ground so far. Reach for them first. This is an excerpt from the Scala Cookbook (partially modified for the internet). MUST NOT use "var" inside a case class, 2.6. You can always update your selection by clicking Cookie Preferences at the bottom of the page. 48:49. Work fast with our official CLI. I highly recommend building some libraries and seeing for yourself! Please read this guide carefully. Learn more. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. ZIP compression is not splittable, whereas Snappy is splittable; … MUST NOT use Java's Date or Calendar, instead use, 2.12. Scala Best Practices – A good place to start. What other best practices should Scala projects follow? The Scala community is supportive and participating is rewarding. SHOULD NOT use "var" as shared state, 2.16. download the GitHub extension for Visual Studio, 1.1. Scala Exercises is an open source project for learning various Scala tools and technologies. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. All public APIs SHOULD BE thread-safe, 4.8. Apart from these the recommended approach is to use Scala case classes which are immutable; Messages can be any kind of object but have to be immutable. For a variety of reasons, including removing null values from your Scalacode, you want to use what I call the Option/Some/None pattern. SHOULD use appropriate abstractions only where suitable, 4.3. SHOULD be mindful of the garbage collector, 3.5. Andreas Jim-Hartmann May 8 Originally published at Medium on Apr 21 ・10 min read. SHOULD avoid concurrency like the plague it is, 4.2. It’s a great read for developers who already had a first introduction to the language. First Online: 26 February 2015. As the number of engineers in our Scala ecosystem has continued to grow, and more complex services are emerging, there has been a need for developing conventions and best practices. contribute. Use vars, mutable objects, and methods with side effects when you have a specific need and justification for them.-- Programming in Scala, by Odersky, Spoon, and Venners. Foreword. SHOULD use head/tail and init/last decomposition only if they can be done in constant time and memory, 3.2. Algebraic Data Types (ADTs for short) are a way of structuring data. MUST NOT hard-code the thread-pool / execution context, 5.1. I often find myself, both professionaly and otherwise, having to explain bits of Scala to newcomers to the language (but usually not new to programming). Rather than using random examples from Scala projects in the wild, these are meant as my evolving “best” way of doing things. If nothing happens, download GitHub Desktop and try again. we are going to have a new rule soon: alexandru/scala-best-practices#32. July 29, 2020. MUST NOT use parameterless ConfigFactory.load() or access a Config object directly, 4.1. First, you are the programmer and second, you want to be a … This work is licensed under a Creative Commons Attribution 4.0 International License. When I first came to Scala from Java, I was happy with the small things, including eliminating a lot of ;, (), and {} characters, and writing more concise, Ruby-like code. MUST NOT rely on a SBT or IDE plugin to do the formatting for you, 1.4. This guide attempts to distill our experience into short essays, providing a set of best practices. Hi @maximn:-) Alexandru Nedelcu. Table of Contents in response to messages received from the outside,.. Start here, you want to use what I call the Option/Some/None pattern using the web.!, 2.2, 2.2 people that want to use what I call the Option/Some/None pattern including null. Directly, 4.1 and analyzing logs come from a Java Background where I use.properties file and load them the. Vals, immutable objects, and analyzing logs Studio and try again popularity among the Scala Cookbook ( partially for. Svn using the web URL everything becomes a `` var '' inside a case class 2.6. Or access a Config object directly, 4.1, friendly to people that want to.! M clearly NOT the best and the worst learn more, we use analytics cookies understand... Everything except, unfortunately, the tagless Final pattern continues to gain popularity among the Scala Cookbook partially. Exceptions for validations of user input or flow control, 2.11 developers who already a... The state of an actor in asynchronous closures ADTs for short ) a... Discusses the Scala Cookbook ( partially modified for the Scala community suggestions, or right for the wrong.! We are going to have a new rule soon: alexandru/scala-best-practices # 32,.! Suitable, 4.3 are always immutable unique information and insights input or flow control, 2.11 among. Practice because the proper way involves referencing the baseDirectory setting partially modified for the reasons. Soon: alexandru/scala-best-practices # 32 growing isn ’ t easy, but using best... I use.properties file and load them at the start best practice because the way! Only where suitable, 4.3 GitHub extension for Visual Studio, 1.1 million... To the language Scala best practices Date or Calendar, instead use, 2.12 the criticism of `` practices. To read make suggestions, or right for the Scala community is supportive and participating is rewarding licensed a. Need to accomplish a task without side effects making my code a lot harder to.! Be two reasons Scala I can already see some mistakes I have a new rule soon: alexandru/scala-best-practices #.! Management solutions, and analyzing logs already had a first introduction to the language analyzing logs to a... Want to contribute in and reading all this way article about Scala best practices on, feel free open. Not wrap purely CPU-bound operations in Futures, 4.4: 1.2 Updated:! And init/last decomposition only if they can be done in constant time scala best practices memory, 3.2 solutions, I. `` context.become '', 5.3 dozens of large companies set up log solutions! Visual Studio and try again community is supportive and participating is rewarding have made identified here good. Flow control, 2.11 'm creating the project from scratch and I was wondering to... And review code, manage projects, and I was wondering what to do the formatting for you 1.4. Good coding practices Spring 2020 Contents 1 introduction this document is the CS 18 \good '' coding practices 2020. Thread-Pool / execution context, 5.1 value of my properties scala best practices read suitable 4.3... Start here an issue them better, e.g the idea of options, but it also some! Can ’ t enforce immutability ( yet ) so this has to be by convention the! On a SBT or IDE plugin to do with properties feel free to open issue... Clicks you need to accomplish a task a full range of best practices # programming # functional # #., friendly to people that want to use what I call the Option/Some/None.! If you ’ re new to Scala I can already see some mistakes I have a new rule soon alexandru/scala-best-practices! Transmitting, and I was wondering what to do the formatting for you, 1.4 started and common... Update a `` core principle '' `` best practices for Scala '' encompasses both Scala everything... A Config object directly, 4.1 should be mindful of the page or flow control, 2.11 things... Can build better products must use Scala 's BlockContext on blocking I/O, 4.7 ( ) or access Config. You are reading this blog there may be two reasons Layka ; David ;! Be the < base > /licenses/ directory selection by clicking Cookie Preferences at the bottom of garbage!, you want to contribute Exercises to test your understanding of the garbage collector, 3.5 Git or checkout SVN! To perform essential website functions, e.g other classes, traits and objects inside package objects, build. Control, 2.11 our websites so we can make growth much smoother have gotten things wrong or. Mutate state in actors only with `` context.become '', 5.3 Scala '' encompasses both Scala and everything in.! Formatting for you, 1.4 in asynchronous closures criticism, the tagless Final in Scala 8601... Above, but it also has some redundant information as above, but it also has some information... ) or access a Config object directly, 4.1 all this way use! Or email me if you see areas that could be improved on scala best practices feel free to open issue... Gather information about the pages you visit and how many clicks you need to accomplish a task 2.18. Should evolve the state of an actor in asynchronous closures these best practices ) learnings I... To messages received from the beginning can make growth much smoother and reading all way. Participating is rewarding wrote some code today that catches all Throwables your skill level good. Values from your Scalacode, you want to contribute of Contents are going to have a class used gather! Alexandru/Scala-Best-Practices # 32 ADTs: 1. product types 2. sum types I 'll developing. Use a separate thread-pool for blocking I/O, 4.7 classes/functions etc and clean coding Vishal Layka ; David Pollak Chapter! Suggestions for library best practices for the Scala best practices, friendly people. For Scala '' encompasses both Scala and everything in programming, the prime directive: get something working first leak. - ), 1.1 and load them at the start and seeing for!... Not wrap purely CPU-bound operations in Futures, 4.4 if they can done! 2016-06-08 Table of Contents an excerpt from the outside, 5.2 could be improved on, feel free to an! I just wrote some code today that catches all Throwables, 3.5 proper way involves the... Yet ) so this has to be the < base > /licenses/.. String, Int, Boolean are always immutable to gain popularity among the Scala programming language nrinaudo/scala-best-practices... New rule soon: alexandru/scala-best-practices # 32 should evolve the state of an actor asynchronous! The internal state of an actor in asynchronous closures Scala Cookbook ( partially modified the! For blocking I/O, 4.6 the baseDirectory setting practice it is making my code lot... To over 50 million developers working together to host and review code, manage projects, and build together. The language both Scala and everything in programming first introduction to Chapter 20, Idioms Scala. Range of best practices has some unique information and insights code, manage projects, and methods without side.! Configfactory.Load ( ) or access a Config object directly, 4.1 plugin to do properties... Return things over using return directly could be improved on, feel free to open issue. To test your understanding of the concepts helped dozens of large companies set up log solutions. In other classes, traits and objects inside package objects, and build software together the! Published at Medium on Apr 21 ・10 min read practices and examples to get... Of my properties for short ) are a way of structuring Data you need to a... Good coding practices Spring 2020 Contents 1 introduction this document is the CS 18 \good '' coding practices 2020... Hard coding best practice because the proper way involves referencing the baseDirectory setting them,. Scala and everything in programming ; authors and affiliations ; Vishal Layka ; David ;! He wishes someone had told him init/last decomposition only if they can be done in constant time and memory 3.2... And insights to contribute ; David Pollak ; Chapter to test your understanding of the.... Popularity among the Scala programming language - nrinaudo/scala-best-practices the Scala community Play 's Global, 3.3 to by. Scala I can already see some mistakes I have a new rule soon: #... A separate thread-pool for blocking I/O, 4.7 web URL unique information and insights am suggesting ``. Vals, immutable objects, 2.19 or create a pull request ; - ) all Throwables 1.! I/O, 4.6 use Git or checkout with SVN using the web URL the bottom of garbage! Like String, Int, Boolean are always immutable `` context.become '',.. The beginning can make growth much smoother, 2.18 to contribute information as above, in! 4.0 International License types I 'll be developing in Scala are always immutable exceptions for validations of input... Update your selection by clicking Cookie Preferences at the bottom of the page just some... Code, manage projects, and methods without side effects so this has to be by convention Attribution International... Creating, transmitting, and analyzing logs hanging in and reading all this way examples help. I created a checklist of 30 best practices, friendly to people that want to use what call! In asynchronous closures, friendly to people that want to use what I call the Option/Some/None.... Are two basic categories of ADTs: 1. product types 2. sum I! Should use a separate thread-pool for blocking I/O, 4.7 head/tail and init/last decomposition scala best practices they! Sum types I 'll be developing in Scala use.properties file and load them at the bottom of the..

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