Problem Solving with Maybe
Maybe has a tendency to take over your codebase. This property is sometimes described as being viral. Uncertainty begets uncertainty. This sort of defeats the goal of using Maybe in the first place: give you confidence in the presence of most values. By slightly changing our approach to solving problems involving uncertainty, we can contain Maybe to those parts of our code that are truly optional.
The Mechanics of Maybe
Our world is full of uncertainty. This uncertainty bleeds into our programs. A common way of dealing with this is null/nil. Unfortunately, this leads to even more uncertainty because this design means any value in our system could be null unless we’ve explicitly checked it’s presence. Constantly checking the presence of every value is a lot of work so we tend to only check the riskiest places and
5 Common JSON Decoders
You’ve learned the basics of decoding JSON in Elm and are comfortable converting JSON into records. However, real life has a tendency to give you tricky JSON to work with that doesn’t fit neatly with this approach. Here are five scenarios I commonly run into and how to decode them. In all these examples, you can assume the decode library has been imported like:
Extending Elm Native UI with JavaScript
You may have heard about our foray into writing a native app using Elm Native UI. Purple Train accomplishes its goals quite well for us. It’s not only a useful product, it’s also a learning experience for us. We decided that it’s only fair for us to try to push the boundaries of the technology. After we submitted the first Elm version to the Apple App Store, I entered what I thought would be a sim
Introduction to The Elm Architecture and How to Build our First Application | CSS-Tricks
Creating our first Elm application might seem like a hard task. The new syntax and the new paradigm can be intimidating if you haven’t used other functional programming languages before. But once you create your first application, you will understand why Elm has been gaining so much attention lately. In this article, we are going to build a simple application that will introduce us to the language
Elm Native UI in Production
In November, thoughtbot released a new app called Purple Train. The app was implemented in React Native, which we’ve been using to rapidly build cross-platform apps. We’ve grown to love React Native thanks to a number of improvements over traditional mobile dev, such as a (mostly) declarative API, quicker development cycles, familiarity to web developers and designers, and cross-platform builds. W
Why Elm? (And How To Get Started With It) | CSS-Tricks
UGURUS offers elite coaching and mentorship for agency owners looking to grow. Start with the free Agency Accelerator today. If any discussion of the biggest problems in web development, there is no doubt complexity comes up. Between the use of dozens of tools, dependencies, and complexities inherent in the languages themselves, complexity is part of the job. Modern web applications require new wa
Lessons Learned: Avoiding Primitives in Elm
Ben, Joël and I recently built an Elm application over two investment days, with a focus on trying out a new (to us!) paradigm in Elm. In this application, we avoided type aliases and primitive types (String, Int, etc.) in favor of product types. One of our types was for currency. Let’s break down the three ways we could declare this: -- primitive type (Int) type alias Player = { dollarsOnHand : I
10000行超のElmを書いて見つけたベストプラクティス - ジンジャー研究室
この記事はElm Advent Calendar 2016 の4日目です。 会社で書かせてもらってるElm製アプリが10000行を超えたので、現時点で個人的にこれはと思うベストプラクティスを実際のソース付きで書いてみる。 github.com （アプリについての情報は機会があれば） 1.必ずスタイルガイドに従う 行数が増える傾向にあるが、かなり読みやすくなるので絶対に従った方が良い。 Style Guide 関連コミット （let...in中に空行を挿入している） 2.データ構造にタプルを使わない 例えばマウスの位置などをタプルで(Int, Int)のように書きたくなる。しかし後悔するのでやめた方が良い。 -- 微妙 calculateX : Model -> Int calculateX model = let (x, y) = model.position in max 0 x --
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Configuring an Elm App with Environment Variables via webpack
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A Farewell to FRP: Making signals unnecessary with The Elm Architecture - elm-lang.org
https://www.classes.cs.uchicago.edu/current/22300-1/Home.html
The Pragmatic Studio