#scala

#scala

ScalaTest's info function can be used to print output for visibility within unit tests, unlike println or System.err.println. [ more ]

Use %% for Scala-specific libraries and % for other JVM dependencies in SBT build.sbt files for Scala projects. [ more ]

Install VSCode, Java, and sbt on your computer

Configure VSCode settings and install the necessary extensions

Create a new Scala project in VSCode and run your Scala code [ more ]

Feature engineering is crucial for unlocking insights from complex data sets.

Time series feature engineering requires specialized methods due to temporal dependencies. [ more ]

Understanding 'type mismatch' error in Scala - mismatch between expected and actual data types.

Resolving 'type mismatch' by correcting data type or using type casting. [ more ]

Ducktape is an automatic and customizable compile-time transformation tool for case classes and sealed traits/enums in Scala.

The name 'ducktape' signifies its potential to generate glue code, despite being originally intended as 'ducttape'. [ more ]

Scala threads are created similarly to Java threads with slight syntax differences.

Java Runnable can be used in Scala to create threads by implementing the run method. [ more ]

AWS Glue is highly scalable, cost-effective, and integrates well with other AWS services for orchestrating complex pipelines.

Performance issues exist in AWS Glue when dealing with large Python-based Pyspark jobs due to expensive data shuffling between JVM and Python processes. [ more ]

Pattern matching in Scala allows for matching data structures like case classes and lists.

Sealed types in Scala are used for exhaustive pattern matching and restricting subclasses. [ more ]

Pattern matching in Scala can be performed on regular expression strings in a match expression.

Regular expressions can be defined as a Regex type and used for pattern matching in Scala. [ more ]

Pattern matching is a powerful feature in Scala for value comparisons and deconstructing values.

Scala uses match expressions for pattern matching, allowing for checking values against various patterns like constants, constructors, and more. [ more ]

XML is semi-structured data essential for serialization, deserialization, and pattern matching in Scala.

Scala supports XML literals, easy manipulation, loading, and saving using tag and attribute structures. [ more ]

Extractors generalize pattern matching beyond case classes

Scala's extractors enable defining new patterns for existing types [ more ]

Using mkString method of Array class can convert Scala sequence (like Array, List, Seq) to a String.

mkString function can be customized with any separator string to format the output as desired. [ more ]

Scala 2 and Scala 3 if/then/else syntax differences.

Scala allows if/then statements to return a value, eliminating the need for a ternary operator. [ more ]

Scala REPL under MS Windows faced issues with JLine library.

Proposal for a swing-based REPL in Scala for improved functionality. [ more ]

Scala helped SwissBorg beat the average by leveraging its expressiveness and ecosystem.

Scala's scalability, coupled with partnerships with Scala-specialized companies, supported SwissBorg's growth. [ more ]

Scala developers commonly handle currency using the BigDecimal class.

Joda Money is a promising currency library for Scala development. [ more ]

Start the Mill REPL in the root directory of a Scala project by using the mill command. Choose a specific main method to run interactively within the REPL by specifying the class and package names. [ more ]

To run a Scala script as a Unix/Linux shell script, use a special syntax in the script file.

The 'exec' command in the shell script uses $0 to refer to the script file and $@ to refer to positional parameters. [ more ]

You can use the startsWith method on a String to match multiple patterns in a Scala match expression.

The example provided demonstrates how to use startsWith in a Scala match expression to generate different outputs based on the starting patterns of the input. [ more ]

Scala varargs syntax allows defining functions with a variable number of arguments using * symbol after parameter type declaration.

Scala varargs array is created within the function when using the varargs syntax. [ more ]

Using foldLeft in Scala can offer a more efficient alternative to map/sum approach for certain algorithms.

There are multiple ways to implement a sum of the squares algorithm in Scala, showcasing the flexibility and readability of the language. [ more ]

Kotlin uses componentN function to unpack values from an object.

Scala's case classes have helpful methods like apply, unapply for deconstruction. [ more ]

Scala simplifies object equality by using the == operator for 'natural' equality, akin to the equals method in Java.

Defining the equals method in Scala requires attention to potential pitfalls like wrong signature, inconsistent behavior, and handling mutable fields. [ more ]

Use chaining to resolve collisions in hash map implementation

Support operations add, remove, and get with immutability for new map creation. [ more ]

Higher-order functions like map, flatMap, and filter are powerful in Scala but can complicate code readability.

For expressions in Scala simplify problem-solving by internally utilizing map, flatMap, and filter operations for optimization. [ more ]

Circe is powerful but sometimes misunderstood

Circe provides building blocks for encoding and decoding JSON [ more ]

Implicit conversions and parameters in Scala enhance libraries by allowing types to act as subtypes, simplifying code.

Implicits automate repetitive tasks, focusing on core logic, improving code readability and conciseness. [ more ]

Step-by-step guide for configuring Hadoop and Spark on Ubuntu 22.04 LTS

Demonstrating CSV file loading into HDFS and data manipulation with Spark using Scala [ more ]

Weekly Scala news roundup by Petr Zapletal. [ more ]

The Cake Pattern in Scala enables modular programming and simplifies dependency management.

The Cake Pattern breaks down applications into interchangeable traits, making code management and updates easier. [ more ]

The code snippet is an example of counting the occurrences of unique elements in a list of objects.

The code uses foldLeft and mutable Map to efficiently count the elements. [ more ]

Scala updates and developments from February 12, 2024. [ more ]

Kotlin and Scala both offer destructuring assignment to extract values from data structures.

Java 21 also introduces deconstructing fields of a Java record. [ more ]

Ensuring a secure and seamless user registration process is important for online platforms.

This article discusses the use of Scala, http4s, Slick, Redis, and PostgreSQL to create a robust web service for user registrations. [ more ]

flatMap and case statements used to extract entities and addresses from a Set[Entity]

map used to extract street fields from addresses [ more ]

Creating a Scala Ammonite REPL startup file allows you to customize the REPL environment.

The predef.sc file can be edited to include custom commands and imports in the Ammonite REPL. [ more ]

Use Jsoup to manipulate HTML content in Scala

Create nested DIVs in Scala using Jsoup [ more ]

Install Scala CLI and create a single file Scala script.

The script uses Google APIs to interact with Gmail and delete unread emails. [ more ]

1. This edition of #ThisWeekInScala covers the latest news and updates in the Scala programming language.

2. The article is written by Petr Zapletal and provides a summary of the events that occurred in the Scala community during the week of January 15, 2024. [ more ]

The training videos are 100% free with no ads or paywalls.

More free Scala and functional programming video courses will be added in the future. [ more ]