Scala’s Types of Types
This blog post came into being after a few discussions about Types in Scala after some of JavaOne’s parties in 2013. After those discussions I figured that many questions are often repeated by different people, during their learning of Scala. I though that we didn’t have a full list of all tricks what we can to with Types in Scala, so I decided to write such a list - giving real life examples why
Hands-on Scala.js
Hands-on Scala.js Writing client-side web applications in Scala var x = 0.0 type Graph = (String, Double => Double) val graphs = Seq[Graph]( ("red", sin), ("green", x => abs(x % 4 - 2) - 1), ("blue", x => sin(x/12) * sin(x)) ).zipWithIndex dom.window.setInterval(() => { x = (x + 1) % w; if (x == 0) clear() for (((color, f), i) <- graphs) { val offset = h / 3 * (i + 0.5) val y = f(x / w * 75) * h /
Can a function return one of multiple types which do not share a common ancestor?
Of course I realize all types do have a common ancestor, but what I mean is this: In dynamically-typed languages, it is a common practice to have 'mixed' return types. A common case is a function which attempts to retrieve data from a database, then returns either an object (initialized with the found data) or FALSE (in the event no data was found). A little pseudocode to demonstrate just such an
【Scala】しょっちゅう忘れる、AWSのAPI（逆引き）Scala S3編【AWS】 - Qiita
val credentials = new BasicAWSCredentials(アクセスキーキー, シークレットキー) val s3Client = new AmazonS3Client(credentials) val localFilePath = "ローカルのファイルパス" val s3BucketName = "バケット名" val s3FilePath = "S3のアップロード先のパス" val upReq = new PutObjectRequest(s3BucketName, s3FilePath, localFile) s3Client.putObject(upReq) val credentials = new BasicAWSCredentials(アクセスキーキー, シークレットキー) val s3Client = new AmazonS3Client(crede
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AI-driven Newsletter Welcome to the latest edition of Last month in AI! September turned into AI’s funding frenzy month: record-breaking raises hit the double-digit billions, frontier labs shipped trillion-parameter models, and, because this is 2025, companies started measuring data centers in gigawatts instead of GPUs.Also, NVIDIA invented a GPU co-processor, and xAI accused OpenAI of […]
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Learning Scala: Top Resources - Codacy | Blog
Since at Codacy we chose Scala to build our infrastructure, it’s important that we provide resources for learning Scala to our engineers (not all the engineers that we hire are Scala experts). Scala isn’t hard to learn, and good engineers usually pick it up very quickly. Here is a compiled list of Scala resources to kickstart your Scala learning. Online Resources Functional Programming Principles
Spark の MLlib を使った Dataproc でのレコメンドシステムの実装 - Qiita
はじめに 前回の Advent Calendar の投稿では, 簡単に Dataproc の特徴について説明を行いましたが、今回は, 実際に Dataproc を使ったレコメンドシステムの実装について解説したいと思います。 実装するシステムの概要 【追記】 下記では、BigQuery から直接読み込む実装にしていますが、データ量が大きい場合（数百MB以上）は、テキストデータに比べて読み込みに大幅に時間がかかるため、BigQuery から GCS へ一旦エクスポートし、CSVファイルとして読み込むことをお勧めします。 本投稿では、ユーザーのアイテムに対するLikeや閲覧履歴から、ユーザーに対してアイテムをレコメンドするシステムを実装します。ライブラリとしては、Matrix Factorization を Alternating Least Square という手法で計算するライブラリを使って
A SQL query DSL for Scala by ScalikeJDBC
Java, SQL and jOOQ. Best Practices and Lessons Learned from Writing Awesome Java and SQL Code. Get some hands-on insight on what's behind developing jOOQ. There are a tremendous amount of SQL APIs natively written in Scala. Manuel Bernhardt has summarised a nice collection in his a post. Another collection of Scala SQL APIs can be seen in this Stack Overflow question. One API that we want to focus
How to use Scala as a scripting language | alvinalexander.com
This is an excerpt from the Scala Cookbook (partially modified for the internet). This is Recipe 14.10, “How to use Scala as a scripting language.” Problem You want to use Scala as a scripting language on Unix systems, replacing other scripts you’ve written in a Unix shell (Bourne Shell, Bash), Perl, PHP, Ruby, etc. Solution Save your Scala code to a text file, making sure the first three lines of
Scala as a platform for statistical computing and data science
Darren Wilkinson's blog Statistics, computing, functional programming, data science, Bayes, stochastic modelling, systems biology and bioinformatics Menu and widgets There has been a lot of discussion on-line recently about languages for data analysis, statistical computing, and data science more generally. I don’t really want to go into the detail of why I believe that all of the common choices a
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http://www.scala-lang.org/docu/files/ScalaByExample.pdf
GitHub - xitrum-framework/scalive: Connect a Scala REPL to running JVM processes without any prior setup
Improving Spark Performance With Partitioning - Sortable Engineering Blog
How to provide default value for implicit parameters at class level
Understanding Implicits in Scala
https://mandar2812.github.io/DynaML/
A simple PuSH client with Scala and Restlet
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