Data Models: A Comprehensive Guide to Structuring Information for Optimal Insights and Decision-Making In the realm of data management, the use of effective data models plays a pivotal role in organizing and representing information in a structured and meaningful way. Data models serve as the blueprint for databases, facilitating efficient data storage, retrieval, and analysis. This article delves
This article was peer reviewed by Tom Greco, Dan Prince and Yaphi Berhanu. Thanks to all of SitePoint’s peer reviewers for making SitePoint content the best it can be! Almost every developer has had the experience of maintaining or taking over a legacy project. Or, maybe it’s an old project which got picked up again. Common first thoughts are to throw away the code base, and start from scratch. Th
Next: Contents Contents New version now available here at www.dataorienteddesign.com/dodbook/ This page is from the beta release of the Data-Oriented Design book. There are errors, spelling and factual, and this page is only kept for purposes of maintaining old links. Data-Oriented Design Richard Fabian Contents Introduction Data-Oriented Design It's all about the data Data is not the problem doma
A collection of free resources made by designers at Facebook.A collection of free resources made by designers at Facebook. iOS 9 GUI (iPhone) Photoshop and Sketch templates of GUI elements found in the public release of iOS 9. Diverse Device Hands Two different diverse hands holding various modern smartphones (iPhone 4-6+, Nexus, Windows Phone).
第2引数のユニークなIDは、メニューアイテムが選択された時に呼ばれるActivityクラスのonOptionsItemSelectedメソッドで、どのメニューアイテムが選択されたかの識別に使います。 サンプルではMENU_ID_A〜Cを0~2として定義しておいてそれぞれのメニューアイテムのユニークIDとして使用しています。 サンプルでメニューボタンを押した場合 メニューアイテムの選択のイベント処理 メニューアイテムが選択されるとActivityクラスのonOptionsItemSelectedメソッドが呼ばれます。 前述の通りこのメソッドの中で、どのメニューアイテムが選択されたかを判断して、必要な処理を行います。 onOptionsItemSelectedメソッドの引数には選択されたMenuItemクラスが渡ってきます。getItemIdメソッドでMenuクラスのaddメソッドで追加した時
Replacing Throwing Exceptions with Notification in Validations If you're validating some data, you usually shouldn't be using exceptions to signal validation failures. Here I describe how I'd refactor such code into using the Notification pattern. 09 December 2014 I was recently looking at some code to do some basic validation of some incoming JSON messages. It looked something like this. public v
追記: 情報が色々と古くなったため、2020年に書き直した版へのリンクを張っておきます。 この記事は VirtualDOM Advent Calendar 2014 - Qiita の初日です。 初日ということで、基調講演風に、Virtual DOMとはなにか、なぜ僕はこんな興奮しているのか！という話から。 Virtual DOMとはなにか 既存の概念で当てはめると、JavaScriptのMVC, MVW(Whatever)フレームワークのViewに位置します。が、その程度では終わりません。仮想DOMとは世界を革命する力であり、このjQueryのDOM操作で汚れきったフロントエンドを救う救世主なのです。 現時点で自分が知っている限りは、以下の実装を指します。 facebook/react 最も使われてるFacebookの実装 Matt-Esch/virtual-dom Altenative
Promises are not slow. At least, not anymore. Infact, bluebird generators are almost as fast as regular callback code (they're also the fastest generators as of now). And bluebird promises are definitely at least two times faster than async.waterfall. Considering that bluebird wraps the underlying callback-based libraries and makes your own callbacks exception-safe, this is really amazing. async.w
This post is from 2014 - check out the update! For most of the nearly twenty years since its inception, JavaScript lacked many of the niceties that made other programming languages like Python and Ruby so attractive: command-line interfaces, a REPL, a package manager, and an organized open-source community. Thanks in part to Node.js and npm, today's JavaScript landscape is dramatically improved. W
Promises are very simple once you get your head around them, but there are a few gotchas that can leave you with your head scratching. Here are a few that got me. Nested Promises You get a whole bundle of promises nested in eachother: loadSomething().then(function(something) { loadAnotherthing().then(function(another) { DoSomethingOnThem(something, another); }); }); The reason you’ve done this is
Hey, you! This is a guide intended to introduce new developers to JavaScript and help experienced developers learn more about its best practices. Despite the name, this guide doesn't necessarily mean "the only way" to do JavaScript. We just gather all the articles, tips, and tricks from top developers and put it here. Since it comes from exceptional folks, we could say that it is "the right way",
Shamelessly ripped off from Programming in Scala, second edition. I did ask for permission, though. Basically, while I'm going through the book, I'm taking notes and pushing them here, so I can later use this page as a Scala quick reference. If you, by some incredible chance, find any of this useful, please do buy the book. No, I don't get the kick back. As you can see, the book link is clean :) B
The Four Architectures that will inspire your programming
This is the Big 4. The architectures, that may help your work. They may influence the way you think about programming. 1. The Hexagonal Architecture (also known as the Ports and Adapters) Originally described by Alistair Cockburn in http://alistair.cockburn.us/Hexagonal+architecture. Enhanced and popularised by Steve Freeman and Nat Pryce, thanks to their book: http://www.growing-object-oriented-s
As your Ruby/Rails codebase grows, it’s important to take note of patterns that are or are not working. As we move into 2014 here at Reverb, with a year of experience in building and maintaining a large marketplace at breakneck velocity, here are our learnings. These tips assume you are growing a sizeable Rails codebase with a domain layer living outside of Rails. If you need help getting started
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