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Total of 677 Scala Solutions
Difference between == and === in Scala, Spark
Scala
Apache Spark
Advantages of Scala's type system
Scala
Types
The type system in Scala is Turing complete. Proof? Example? Benefits?
Language Agnostic
Scala
Type Systems
Turing Complete
How can colored terminal output be disabled for sbt/play?
Scala
Playframework
Sbt
Functions vs methods in Scala
Scala
How to split strings into characters in Scala
String
Scala
Character Encoding
Split
Character
What's the status of Scala.React?
Scala
Frp
scala: How to pass an expanded list as varargs into a method?
Scala
Map
Variadic Functions
Why does a small change to this Scala code make such a huge difference to performance?
Performance
Optimization
Scala
Why are Arrays invariant, but Lists covariant?
Arrays
List
Scala
Covariance
Declare variable in a Play2 scala template
Html
Scala
Templates
Playframework
Playframework 2.0
In Scala, how to get a slice of a list from nth element to the end of the list without knowing the length?
Scala
Scala - how to print case classes like (pretty printed) tree
Scala
Pretty Print
Case Class
How to cancel Future in Scala?
Multithreading
Scala
Future
Is there a generic way to memoize in Scala?
Scala
Scope
Dynamic Programming
Memoization
Forward Reference
Google Maps API v2 SupportMapFragment inside ScrollView - users cannot scroll the map vertically
Android
Scala
Google Maps-Android-Api-2
Why does Spark fail with java.lang.OutOfMemoryError: GC overhead limit exceeded?
Scala
Apache Spark
How to model type-safe enum types?
Scala
Enums
Get field names list from case class
Scala
Converting Java to Scala durations
Scala
Config
Duration
Scala Java-Interop
Automatically and Elegantly flatten DataFrame in Spark SQL
Scala
Apache Spark
Apache Spark-Sql
Functional Reactive Programming in Scala
Scala
Functional Programming
"eval" in Scala
Java
Scala
Scripting
Embedding
Is this the proper way to initialize null references in Scala?
Scala
Null
Is there a brief syntax for executing a block n times in Scala?
Scala
How to append or prepend on a Scala mutable.Seq
Scala
Sequence
Scala Collections
Mutable
Valid identifier characters in Scala
Scala
Operators
Immutable Scala Map implementation that preserves insertion order
Scala
Dictionary
Collections
Immutability
Should I use Unit or leave out the return type for my scala method?
Scala
Void
Return Type
What is the relation between Iterable and Iterator?
Scala
Iterator
Fold and foldLeft method difference
Scala
Cross product in Scala
Scala
Functional Programming
Cartesian Product
Cross Product
IntelliJ Idea 12 + Android + Scala nowadays
Android
Scala
Ubuntu
Ide
Intellij Idea
What does the term "reason about" mean in computer science?
Scala
Haskell
Functional Programming
Difference in message-passing model of Akka and Vert.x
Scala
Akka
vert.x
In Scala, difference between final val and val
Scala
Immutability
What's the difference between raw string interpolation and triple quotes in scala
String
Scala
String Interpolation
Is Future in Scala a monad?
Scala
Monads
Unit testing Scala
Unit Testing
Scala
Tdd
How can I construct and parse a JSON string in Scala / Lift
Json
Scala
Lift
Using varargs from Scala
Scala
Variadic Functions
Scala: How do I dynamically instantiate an object and invoke a method using reflection?
Reflection
Scala
Name Mangling
The cost of nested methods
Scala
Methods
What are views for collections and when would you want to use them?
Scala
Views
Scala Collections
Disadvantages of Scala type system versus Haskell?
Scala
Haskell
Type Systems
Static Typing
Language Comparisons
for expressions versus foreach in Scala
Scala
Loops
Foreach
What is the rule for parenthesis in Scala method invocation?
Scala
Is Scala idiomatic coding style just a cool trap for writing inefficient code?
Scala
Performance
What is the difference between def foo = {} and def foo() = {} in Scala?
Scala
Programming Languages
Functional Programming
Jvm
Jvm Languages
Usefulness (as in practical applications) of Currying v.s. Partial Application in Scala
Scala
Partial
Currying
Chart of IEnumerable LINQ equivalents in Scala?
C#
Linq
Scala
Ienumerable
Iterable
How to have Eclipse recognize dependencies from SBT
Eclipse
Scala
Sbt
Sbteclipse
scala, guidelines on return type - when prefer seq, iterable, traversable
Scala
How to set a String in a Option[String]?
Scala
How to read a text file with mixed encodings in Scala or Java?
Java
Scala
Utf 8
Character Encoding
Weka
Hidden performance cost in Scala?
Java
Performance
Scala
Jvm
Microbenchmark
How do I detect if a Spark DataFrame has a column
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Spark unionAll multiple dataframes
Scala
Apache Spark
Apache Spark-Sql
Custom Exception in scala
Scala
Exception
Using Either to process failures in Scala code
Scala
Functional Programming
Either
Increase JVM heap size for Scala?
Scala
Command Line
Jvm
Heap Memory
How to apply a function to a tuple?
Scala
Functional programming, Scala map and fold left
Scala
Map
Functional Programming
Fold
How to choose a random element from an array in Scala?
Scala
Scala 2.8
Scala reference equality
Scala
Scala - can a lambda parameter match a tuple?
Scala
Empty partial function in Scala
Scala
Partialfunction
Scala: join an iterable of strings
String
Scala
Summing values in a List
Scala
Accessing value returned by scala futures
Scala
Future
When to use case class or regular class
Scala
Explain the aggregate functionality in Spark (with Python and Scala)
Python
Scala
Apache Spark
Aggregate
Rdd
scala.concurrent.blocking - what does it actually do?
Scala
Concurrency
java.util.concurrent
Append a column to Data Frame in Apache Spark 1.3
Scala
Apache Spark
Dataframe
How to wait for N seconds between statements in Scala?
Scala
Sleep
java.lang.NoSuchMethodError: scala.Predef$.refArrayOps
Scala
Including null values in an Apache Spark Join
Sql
Scala
Apache Spark
Join
Apache Spark-Sql
How are coroutines implemented in JVM langs without JVM support?
Java
Scala
Jvm
Kotlin
Jvm Languages
why is the lift web framework scalable?
Web Services
Scala
Frameworks
Lift
Is the Lift framework as "easy" as Ruby on Rails or Django?
Ruby on-Rails
Django
Scala
Lift
Scala: How to define "generic" function parameters?
Scala
Haskell
Polymorphism
Type Inference
Different Scala Actor Implementations Overview
Scala
Actor
Lift
Scalaz
Akka
What is a higher kinded type in Scala?
Scala
Generics
Types
Higher Kinded-Types
Type Constructor
What is the difference between = and := in Scala?
Scala
Syntax
Colon Equals
Scala - Get last two characters from string
String
Scala
Typesafe config: Load additional config from path external to packaged scala application
Scala
Configuration
App Config
Config
Typesafe Stack
How do I break out of a loop in Scala?
Scala
For Loop
Break
Tail Recursion
Print the data in ResultSet along with column names
Java
Mysql
Scala
Jdbc
How to convert Row of a Scala DataFrame into case class most efficiently?
Scala
Apache Spark
Apache Spark-Sql
DataFrame equality in Apache Spark
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Rdd
How do I check for equality using Spark Dataframe without SQL Query?
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Derive multiple columns from a single column in a Spark DataFrame
Scala
Apache Spark
Dataframe
Apache Spark-Sql
User Defined-Functions
What types are special to the Scala compiler?
Scala
covariant type A occurs in contravariant position in type A of value a
Scala
Code Coverage Tools for Scala
Unit Testing
Scala
Continuous Integration
Hudson
Code Coverage
How to reload a class or package in Scala REPL?
Scala
Read Eval-Print-Loop
What are the differences between asInstanceOf[T] and (o: T) in Scala?
Scala
Casting
Is it possible to have tuple assignment to variables in Scala?
Scala
Variable Assignment
Tuples
How to reduce Seq[Either[A,B]] to Either[A,Seq[B]]?
Scala
Functional Programming
Scalaz
Scala Cats
Why doesn't Scala have static members inside a class?
Class
Scala
Static
Language Design
Static Members
Scala Map foreach
Scala
Scala Collections
Scala - mutable (var) method parameter reference
Scala
Variables
Methods
Parameters
How to find if a Scala String is parseable as a Double or not?
Scala
Why couldn't twitter scale by adding servers the way sites like facebook have?
Ruby on-Rails
Ruby
Scala
Twitter
What is the === (triple-equals) operator in Scala Koans?
Scala
Scalatest
Scala 2.9
How to exclude commons-logging from a scala/sbt/slf4j project?
Scala
Sbt
Slf4j
How to reference external sbt project from another sbt project?
Scala
Sbt
Throwing exceptions in Scala, what is the "official rule"
Scala
Exception
Try Catch
Either
Filtering a Scala List by type
Scala
values, types, kinds,... as an infinite sequence?
Scala
Haskell
Functional Programming
Higher Kinded-Types
Clarification needed about futures and promises in Scala
Scala
Can't prove that singleton types are singleton types while generating type class instance
Scala
Shapeless
Implicits
Singleton Type
+- Signs in Generic Declaration in Scala
Scala
Generics
How to fully clean, re-resolve and rebuild a Scala sbt-managed project in IDEA?
Scala
Intellij Idea
Sbt
dataframe: how to groupBy/count then filter on count in Scala
Scala
Apache Spark
Apache Spark-Sql
How to open SBT Tool Window in Intellij?
Scala
Intellij Idea
Sbt
-Ywarn-unused-import triggering on play routes file
Scala
Playframework
Sbt
Scalac
What's the difference between join and cogroup in Apache Spark
Scala
Apache Spark
Can a range be matched in Scala?
Scala
Pattern Matching
Range
Matching
Use-cases for Streams in Scala
Scala
Stream
Scala Collections
Function syntax puzzler in scalaz
Scala
Functional Programming
Scala 2.8
Scalaz
Why aren't static methods considered good OO practice?
Java
Scala
Oop
Static Methods
Language Concepts
What is a function literal in Scala?
Scala
Functional Programming
Comparing collection contents with ScalaTest
Unit Testing
Scala
Scalatest
Count all occurrences of a char within a string
Scala
Scala Divide two integers and get a float result
Scala
Casting
Floating Point
Integer
Scala forall example?
Scala
scala class constructor parameters
Scala
Constructor
Scope
Immutability
Scala : fold vs foldLeft
Scala
Reduce
Fold
Output path is shared between the same module error
Scala
Maven
Intellij Idea
How to get around the Scala case class limit of 22 fields?
Scala
Case Class
Scala import not working - object <name> is not a member of package, sbt preppends current package namespace in imports
Scala
Unexpected implicit resolution based on inference from return type
Scala
Type Inference
Implicit
Return Type
Scalaz
Spark read file from S3 using sc.textFile ("s3n://...)
Java
Scala
Apache Spark
Rdd
Hortonworks Data-Platform
Creating a jar file from a Scala file
Java
Scala
Jar
What's the best Scala build system?
Eclipse
Scala
Build
Scala profiler?
Scala
Profiler
How do I exclude/rename some classes from import in Scala?
Scala
Scala 2.8
Operator precedence in Scala
Scala
Operator Precedence
Infinite streams in Scala
Scala
Stream
Idiomatic way to update value in a Map based on previous value
Scala
Map
Immutability
Scala filter on two conditions
Arrays
Scala
Filter
Multiple Conditions
String interpolation in Scala 2.10 - How to interpolate a String variable?
Scala
Scala 2.10
String Interpolation
Play Framework 2.1 - Cannot find an implicit ExecutionContext
Scala
Playframework
Playframework 2.0
How do I convert csv file to rdd
Scala
Apache Spark
What are Scala context and view bounds?
Scala
Implicits
Fetching distinct values on a column using Spark DataFrame
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Spark Dataframe
What is "lifting" in Scala?
Function
Scala
Functional Programming
Lifting
How to use Shapeless in a Quasiquote?
Scala
Scala Macros
Shapeless
Scala Quasiquotes
Difference between method and function in Scala
Function
Scala
Methods
What does a lazy val do?
Scala
Lazy Evaluation
Scala: Abstract types vs generics
Generics
Scala
Abstract Type
Scala Programming for Android
Android
Scala
Resources
Best way to parse command-line parameters?
Scala
Command Line
Command Line-Arguments
Call by name vs call by value in Scala, clarification needed
Scala
Appending an element to the end of a list in Scala
Arrays
Scala
Case objects vs Enumerations in Scala
Scala
Enumeration
Case Class
Difference between case object and object
Scala
Task not serializable: java.io.NotSerializableException when calling function outside closure only on classes not objects
Scala
Apache Spark
Serialization
What is the difference between "def" and "val" to define a function
Scala
Get item in the list in Scala?
Scala
Scala 2.8 breakOut
Scala
Scala 2.8
Scala Collections
How to clone a case class instance and change just one field in Scala?
Scala
How to get started with Akka Streams?
Scala
Akka Stream
Akka Kill vs. Stop vs. Poison Pill?
Scala
Akka
Good scalaz introduction
Scala
Scalaz
What does `:_*` (colon underscore star) do in Scala?
Scala
Pattern Matching
difference between foldLeft and reduceLeft in Scala
Scala
Functional Programming
Fold
Higher Order-Functions
When should I choose Vector in Scala?
Scala
Vector
Scala Collections
What do <:<, <%<, and =:= mean in Scala 2.8, and where are they documented?
Scala
Scala 2.8
Type Constraints
What is the difference between JavaConverters and JavaConversions in Scala?
Scala
Scala Collections
Scala Java-Interop
Spark performance for Scala vs Python
Scala
Performance
Apache Spark
Pyspark
Rdd
How do I cast a variable in Scala?
Scala
Reduce, fold or scan (Left/Right)?
Scala
Scala Collections
Reduce
Fold
Is the Scala 2.8 collections library a case of "the longest suicide note in history"?
Scala
Scala 2.8
Scala Collections
What Scala web-frameworks are available?
Scala
Frameworks
Web Frameworks
Lift
Add JAR files to a Spark job - spark-submit
Java
Scala
Apache Spark
Jar
Spark Submit
How to define "type disjunction" (union types)?
Scala
(Why) do we need to call cache or persist on a RDD
Scala
Apache Spark
Rdd
Scala equivalent of Java java.lang.Class<T> Object
Java
Class
Scala
ScalaTest in sbt: is there a way to run a single test without tags?
Scala
Testing
Sbt
Scalatest
Best way to merge two maps and sum the values of same key?
Scala
Map
Merge
How to select the first row of each group?
Sql
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Getting a structural type with an anonymous class's methods from a macro
Scala
Macros
Scala 2.10
Structural Typing
Scala Macros
Logging in Scala
Logging
Scala
Build.scala, % and %% symbols meaning
Scala
Sbt
Playframework 2.1
How can I change column types in Spark SQL's DataFrame?
Scala
Apache Spark
Apache Spark-Sql
Scala best way of turning a Collection into a Map-by-key?
Scala
Map
Scala Collections
Is asynchronous jdbc call possible?
Java
Scala
Jdbc
Asynchronous
Nonblocking
What is the Scala identifier "implicitly"?
Scala
Implicits
How to turn off INFO logging in Spark?
Python
Scala
Apache Spark
Hadoop
Pyspark
What's the (hidden) cost of Scala's lazy val?
Performance
Scala
Lazy Evaluation
How to read environment variables in Scala
Scala
Environment Variables
Scala: write string to file in one statement
Scala
Scala 2.9
How to sort by column in descending order in Spark SQL?
Scala
Apache Spark
Apache Spark-Sql
What's the standard way to work with dates and times in Scala? Should I use Java types or there are native Scala alternatives?
Datetime
Scala
Jodatime
scala vs java, performance and memory?
Java
Performance
Scala
Memory
Use of def, val, and var in scala
Scala
Why does the Scala compiler disallow overloaded methods with default arguments?
Scala
Methods
Default
Overloading
What's the difference between == and .equals in Scala?
Scala
Equality
Scala Java-Interop
Spark - load CSV file as DataFrame?
Scala
Apache Spark
Hadoop
Apache Spark-Sql
Hdfs
Using comparison operators in Scala's pattern matching system
Scala
Pattern Matching
How to store custom objects in Dataset?
Scala
Apache Spark
Apache Spark-Dataset
Apache Spark-Encoders
Apache Spark: map vs mapPartitions?
Performance
Scala
Apache Spark
Rdd
How to write to a file in Scala?
Scala
File Io
Scala 2.8
Difference between Array and List in scala
Arrays
List
Scala
Scala Collections
Understanding what 'type' keyword does in Scala
Scala
Types
What makes Scala's operator overloading "good", but C++'s "bad"?
C++
Scala
Operator Overloading
Difference between object and class in Scala
Scala
Class
Object
What's the difference between => , ()=>, and Unit=>
Scala
What are type lambdas in Scala and what are their benefits?
Scala
Types
How to quit scala 2.11.0 REPL?
Scala
Scala 2.11
Write single CSV file using spark-csv
Scala
Csv
Apache Spark
Spark Csv
How to convert rdd object to dataframe in spark
Scala
Apache Spark
Apache Spark-Sql
Rdd
Why would I use Scala/Lift over Java/Spring?
Java
Spring
Scala
Lift
Limits of Nat type in Shapeless
Scala
Numbers
Compiler Optimization
Shapeless
How to access test resources in Scala?
Scala
Sbt
What's the best way to inverse sort in scala?
Scala
sbt-assembly: deduplication found error
Scala
Sbt
Sbt Assembly
Hidden features of Scala
Scala
Hidden Features
Scala vs. Groovy vs. Clojure
Scala
Groovy
Clojure
Language Comparisons
Are HLists nothing more than a convoluted way of writing tuples?
Scala
Types
Tuples
Hlist
Shapeless
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
Generics
Scala
Covariance
Contravariance
How to create SBT project with IntelliJ Idea?
Scala
Intellij Idea
Lift
Sbt
Pros and cons of using sbt vs maven in Scala project
Scala
Maven
Sbt
IntelliJ Scala Plugin's case class indentation is absurd
Scala
Intellij Idea
Indentation
Case Class
Unable to create Scala class on IntelliJ
Scala
Class
Intellij Idea
Difference between this and self in self-type annotations?
Scala
What does the `#` operator mean in Scala?
Scala
Type Systems
Scala constructor overload?
Scala
Scala @ operator
Scala
Operators
How to define partitioning of DataFrame?
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Partitioning
Stream vs Views vs Iterators
Scala
Scala Collections
How does '20 seconds' work in Scala?
Scala
Duration
How to get Scala List from Java List?
Java
Scala
Escape a dollar sign in string interpolation
Scala
String Interpolation
Scala: Nil vs List()
Scala
What is a Manifest in Scala and when do you need it?
Scala
Manifest
How do I view the type of a scala expression in IntelliJ
Scala
Intellij Idea
Do scala constructor parameters default to private val?
Scala
Scala Primary-Constructor
What is meant by Scala's path-dependent types?
Scala
Type Systems
Path Dependent-Type
Scala Doubles, and Precision
Scala
Double
Truncate
Rounding
How to split a sequence into two pieces by predicate?
Scala
Debugging Scala code with simple-build-tool (sbt) and IntelliJ
Scala
Intellij Idea
Jetty
Sbt
How to pattern match using regular expression in Scala?
Regex
Scala
What are the best use cases for Akka framework
Java
Scala
Asynchronous
Use Case
Akka
Maven package works but Intellij's build fails
Java
Scala
Maven
Intellij Idea
How to print the contents of RDD?
Scala
Apache Spark
What are the key differences between Scala and Groovy?
Scala
Groovy
How to optimize for-comprehensions and loops in Scala?
Java
Performance
Scala
For Loop
While Loop
How to force IntelliJ IDEA to reload dependencies from build.sbt after they changed?
Scala
Intellij Idea
Sbt
Split list into multiple lists with fixed number of elements
List
Scala
Split
What are some compelling use cases for dependent method types?
Scala
Haskell
Programming Languages
Type Systems
Dependent Method-Type
How to profile methods in Scala?
Function
Scala
Profiling
Aspect
How to update a mongo record using Rogue with MongoCaseClassField when case class contains a scala Enumeration
Mongodb
Class
Scala
Record
Lift
What JSON library to use in Scala?
Json
Scala
Why does "split" on an empty string return a non-empty array?
Java
Scala
In Scala, what exactly does 'val a: A = _' (underscore) mean?
Scala
Initialization
What are all the uses of an underscore in Scala?
Scala
How is pattern matching in Scala implemented at the bytecode level?
Performance
Scala
Pattern Matching
Bytecode
How to convert a scala.List to a java.util.List?
Java
Scala
Scala Java-Interop
Scala downwards or decreasing for loop?
Scala
Iterator
Loops
For Loop
Cleaner way to update nested structures
Scala
Case Class
Zipper
How to read files from resources folder in Scala?
Scala
Scala Collections
SBT stop run without exiting
Scala
Sbt
Terminate
Why does pattern matching in Scala not work with variables?
Scala
Pattern Matching
Match
Understanding scala enumerations
Scala
Enums
What’s the difference between ScalaTest and Scala Specs unit test frameworks?
Unit Testing
Scala
Comparison
Scalatest
Array initializing in Scala
Scala
Array Initialization
Scala: List[Future] to Future[List] disregarding failed futures
Scala
Future
Abstract attributes in Python
Python
Oop
Scala
Abstract Class
Jvm takes a long time to resolve ip-address for localhost
Java
Scala
Jvm
Localhost
Macos Sierra
Preferred way to create a Scala list
Scala
How to filter None's out of List[Option]?
Scala
Option
What limits does scala place on the "acceptable complexity" of inferred types?
Scala
Type Inference
Wrapping null-returning method in Java with Option in Scala?
Java
Scala
Scala Option
private[this] vs private
Scala
What is a "context bound" in Scala?
Scala
Scala 2.8
Context Bound
Scala: what is the best way to append an element to an Array?
Arrays
Scala
Append
What is the rationale behind having companion objects in Scala?
Oop
Scala
Companion Object
How to parse JSON in Scala using standard Scala classes?
Json
Scala
Iterating over Java collections in Scala
Java
Scala
Collections
Scala Java-Interop
Spark - Error "A master URL must be set in your configuration" when submitting an app
Scala
Apache Spark
What are the relationships between Any, AnyVal, AnyRef, Object and how do they map when used in Java code?
Scala
How to convert an Int to a String of a given length with leading zeros to align?
String
Scala
Formatting
Int
How to do an instanceof check with Scala(Test)
Java
Scala
Junit
Scalatest
Scala how can I count the number of occurrences in a list
Scala
Easy idiomatic way to define Ordering for a simple case class
Scala
Sorting
Case Class
How to load local file in sc.textFile, instead of HDFS
Scala
Apache Spark
Idiomatic way to convert an InputStream to a String in Scala
String
Scala
Inputstream
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
Java
Scala
Jms
Actor
Akka
Any reason why scala does not explicitly support dependent types?
Scala
Path Dependent-Type
Dependent Type
Shapeless
What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
Syntax
Scala
How to get the last date of a particular month with JodaTime?
Java
Scala
Jodatime
Understanding why Zipper is a Comonad
Scala
Functional Programming
Zipper
Comonad
Private and protected constructor in Scala
Scala
comparing sbt and Gradle
Scala
Sbt
Gradle
How to convert a java.util.List to a Scala list
List
Scala
Scala Java-Interop
How can I use map and receive an index as well in Scala?
Scala
Functional Programming
Map
Overload constructor for Scala's Case Classes?
Scala
Constructor
Overloading
Scala 2.8
Case Class
Scala actors: receive vs react
Scala
Multithreading
Actor
What does param: _* mean in Scala?
Scala
Syntax
Scala Collections
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries. spark Eclipse on windows 7
Eclipse
Scala
Apache Spark
val-mutable versus var-immutable in Scala
Scala
Collections
Functional Programming
Immutability
How to create an empty DataFrame with a specified schema?
Scala
Apache Spark
Dataframe
Apache Spark-Sql
What is the Scala annotation to ensure a tail recursive function is optimized?
Scala
Tail Call-Optimization
How can sbt pull dependency artifacts from git?
Git
Scala
Build
Sbt
Build Dependencies
Functional design patterns
Scala
Haskell
Functional Programming
Monads
How to compile tests with SBT without running them
Scala
Sbt
Build Tools
What is the difference between build.sbt and build.scala?
Scala
Sbt
Extract column values of Dataframe as List in Apache Spark
Scala
Apache Spark
Apache Spark-Sql
Scala framework for a Rest API Server?
Api
Rest
Scala
Lift
How to see dependency tree in sbt?
Scala
Dependencies
Sbt
What are the disadvantages to declaring Scala case classes?
Scala
Case Class
How to sort a list in Scala by two fields?
Scala
Sorting
Functional Programming
Avoiding memory leaks with Scalaz 7 zipWithIndex/group enumeratees
Scala
Scalaz
Iterate
I want to get the type of a variable at runtime
Scala
Reflection
Scala: What is the difference between Traversable and Iterable traits in Scala collections?
Scala
Scala Collections
Where does the "flatmap that s***" idiomatic expression in Scala come from?
Scala
What is the correct way to get a subarray in Scala?
Scala
Scala Collections
What Automatic Resource Management alternatives exist for Scala?
Scala
Resource Management
How to specify JVM maximum heap size "-Xmx" for running an application with "run" action in SBT?
Scala
Sbt
Functional programming - is immutability expensive?
Java
Scala
Functional Programming
How can I convert immutable.Map to mutable.Map in Scala?
Scala
Dictionary
Scala 2.8
"new" keyword in Scala
Scala
New Operator
Keyword
Naming convention for Scala constants?
Scala
Naming Conventions
Constants
Match multiple cases classes in scala
Scala
Pattern Matching
Elegant way to invert a map in Scala
Scala
Scala Collections
Scala type programming resources
Scala
Types
How do I get the Scala version from within Scala itself?
Scala
Version
How to create a list with the same element n-times?
Scala
Why are `private val` and `private final val` different?
Scala
Private
Final
Java compile speed vs Scala compile speed
Java
Performance
Scala
Compilation
scala tuple unpacking
Scala
Parameters
Tuples
In Scala how do I remove duplicates from a list?
Scala
Can someone explain the right way to use SBT?
Scala
Sbt
How does type Dynamic work and how to use it?
Scala
When to use val or def in Scala traits?
Scala
Inheritance
Traits
Renaming column names of a DataFrame in Spark Scala
Scala
Apache Spark
Dataframe
Apache Spark-Sql
How to save DataFrame directly to Hive?
Scala
Apache Spark
Hive
Apache Spark-Sql
Does the JVM prevent tail call optimizations?
Java
Jvm
Scala
Tail Recursion
How do I list all files in a subdirectory in scala?
Scala
Scala check if element is present in a list
String
List
Scala
Find
Why is Scala's immutable Set not covariant in its type?
Scala
Set
Covariance
Scala Collections
Usages of Null / Nothing / Unit in Scala
Scala
Can I zip more than two lists together in Scala?
Scala
Functional Programming
List
Zip
What does "abstract over" mean?
Scala
Abstraction
What are the use cases of scala.concurrent.Promise?
Scala
Concurrency
Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala APIs)?
Scala
Functional Programming
Reduce
Fold
Scalding
How to build an Uber JAR (Fat JAR) using SBT within IntelliJ IDEA?
Scala
Intellij Idea
Sbt
Meta Inf
Uberjar
Is there a way to take the first 1000 rows of a Spark Dataframe?
Scala
Apache Spark
What is the difference between Scala's case class and class?
Scala
Functional Programming
Case Class
Building big, immutable objects without using constructors having long parameter lists
Java
Oop
Scala
Immutability
Implicit conversion vs. type class
Scala
Coding Style
Implicit Conversion
Defining a function with multiple implicit arguments in Scala
Scala
Return in Scala
Scala
Return
Scala case class inheritance
Scala
Inheritance
Case Class
How to set heap size for sbt?
Scala
Sbt
What are some example use cases for symbol literals in Scala?
Syntax
Scala
Samples of Scala and Java code where Scala code looks simpler/has fewer lines?
Java
Scala
Comparison
Language Features
Convert List of tuple to map (and deal with duplicate key ?)
Scala
Map
How to check whether key or value exist in Map?
Scala
Dictionary
Collections
Difference between using App trait and main method in scala
Scala
Abort early in a fold
Scala
Functional Programming
Difference between Abstract Class and Trait
Scala
Abstract Class
Traits
Package objects
Scala
Scala 2.8
Groovy map method of collections
Scala
Groovy
Functional Programming
Map
Ternary Operator Similar To ?:
Scala
Map both keys and values of a Scala Map
Scala
Editor does not contain a main type
Eclipse
Scala
How to read from standard input line by line?
Java
Scala
Io
java.util.scanner
Efficient iteration with index in Scala
Scala
Iteration
Differences between these three ways of defining a function in Scala
Scala
How do I apply the enrich-my-library pattern to Scala collections?
Scala
Collections
Enrich My-Library
What is an idiomatic Scala way to "remove" one element from an immutable List?
List
Scala
HowTo: Custom Field in Lift-Record-Squeryl
Scala
Lift
Record
Squeryl
How to show custom failure messages in ScalaTest?
Scala
Scalatest
Matcher
Scala underscore - ERROR: missing parameter type for expanded function
Scala
Scala Placeholder-Syntax
SBT Test-Dependencies in Multiprojects: Make the Test-Code Available to Dependent Projects
Scala
Testing
Sbt
When are higher kinded types useful?
Scala
Haskell
Types
F#
Higher Kinded-Types
Interpreting a benchmark in C, Clojure, Python, Ruby, Scala and others
Python
Ruby
Scala
Clojure
Benchmarking
Class broken error with Joda Time using Scala
Scala
Sbt
Jodatime
Convert a Scala list to a tuple?
List
Scala
Tuples
Scala multiple type pattern matching
Scala
Types
Pattern Matching
Reader Monad for Dependency Injection: multiple dependencies, nested calls
Scala
Dependency Injection
Scalaz
Converting a Java collection into a Scala collection
Java
Scala
Scala Collections
Scala 2.7
How to declare empty list and then add string in scala?
Scala
What does => and () => mean in Scala
Scala
Is there a good math/stats library for Scala?
Scala
Math
Statistics
Confused with the for-comprehension to flatMap/Map transformation
Scala
Map
Monads
For Comprehension
Scalaz iteratees: "Lifting" `EnumeratorT` to match `IterateeT` for a "bigger" monad
Scala
Monads
Scalaz
Enumerator
Iterate
Scala: Elegant conversion of a string into a boolean
Scala
What's the difference between :: and ::: in Scala
Scala
scala slick method I can not understand so far
Scala
Playframework 2.0
Magic Methods
Scalaquery
Slick
Get current number of partitions of a DataFrame
Python
Scala
Dataframe
Apache Spark
Apache Spark-Sql
When to use the equals sign in a Scala method declaration?
Scala
Drop into interpreter during arbitrary scala code location
Debugging
Scala
Interpreter
How to pattern match multiple values in Scala?
Scala
Pattern Matching
Logging while testing through Gradle
Java
Scala
Logging
Gradle
How to wait for several Futures?
Scala
Concurrency
Future
How to write unit tests in Spark 2.0+?
Scala
Unit Testing
Apache Spark
Junit
Apache Spark-Sql
How do I sort an array in Scala?
Sorting
Scala
Remove Characters from the end of a String Scala
String
Scala
What are the differences and similarties between Scala traits vs. Java 8 interfaces?
Java
Scala
What are Scala continuations and why use them?
Scala
Scala 2.8
Continuations
Delimited Continuations
An easy way to get rid of *everything* generated by SBT?
Scala
Sbt
How to override apply in a case class companion
Scala
Pattern Matching
Case Class
How to iterate scala map?
Scala
Tuple Unpacking in Map Operations
Scala
Map
Iterator
Tuples
Iterable Unpacking
Intellij compile failures: "is already defined as"
Scala
Intellij Idea
Sbt
Is there an equivalent of Scala's Either in Java 8?
Java
Scala
Java 8
What is the syntax for adding an element to a scala.collection.mutable.Map?
Scala
Map
Add
Mutable
Put
What's the difference between multiple parameters lists and multiple parameters per list in Scala?
Scala
Currying
Partial Application
Markdown to HTML with Java/Scala
Java
Scala
Markdown
How to pass -D parameter or environment variable to Spark job?
Scala
Apache Spark
What is the Scala equivalent of Java's ClassName.class?
Scala
What is the motivation for Scala assignment evaluating to Unit rather than the value assigned?
Scala
Functional Programming
Io
Assignment Operator
What do all of Scala's symbolic operators mean?
Scala
Operators
Composing Option with List in for-comprehension gives type mismatch depending on order
Scala
For Loop
Type Mismatch
For Comprehension
Scala Option
Two ways of currying in Scala; what's the use-case for each?
Scala
Coding Style
Currying
Scala currying vs partially applied functions
Scala
Functional Programming
Currying
How to pass Scala array into Scala vararg method?
Arrays
Scala
Variadic Functions
What is the point of the class Option[T]?
Java
Scala
Null
Functional Programming
Monads
How to check whether a String fully matches a Regex in Scala?
Regex
Scala
What design decisions would favour Scala's Actors instead of JMS?
Java
Scala
Jms
Actor
Where does Scala look for implicits?
Scala
Implicit Conversion
Implicits
How to read a file as a byte array in Scala
Scala
Io
Bytearray
Pattern matching vs if-else
Scala
How does HashPartitioner work?
Scala
Apache Spark
Rdd
Partitioning
What are the pros of using traits over abstract classes?
Scala
Traits
On Performance and Java Interoperability: Clojure vs. Scala
Java
Performance
Scala
Clojure
Jvm
Scala capture group using regex
Regex
String
Scala
Capturing Group
How to take input from a user in Scala?
Scala
Scala classOf for type parameter
Scala
How to manage multiple interdependent modules with SBT and IntelliJ IDEA?
Scala
Intellij Idea
Sbt
Sbt Idea
how to set main class in SBT 0.13 project
Scala
Sbt
how to make saveAsTextFile NOT split output into multiple file?
Scala
Apache Spark
How do I replace a program written as a sequenced stream of state transitions with scalaz-stream?
Scala
Scalaz
Scalaz Stream
What is the purpose of type ascriptions in Scala?
Scala
Static Typing
Ascription
Mixins vs composition in scala
Scala
Composition
Mixins
How to prevent java.lang.OutOfMemoryError: PermGen space at Scala compilation?
Scala
Apache Spark
Memory Management
Sbt
Scalatra Sbt
What is "polymorphism a la carte" and how can I benefit from it?
Scala
Functional Programming
Typeclass
Multimethod
How to configure a fine tuned thread pool for futures?
Multithreading
Scala
Parallel Processing
Threadpool
Future
withFilter instead of filter
Scala
Lazy Evaluation
Scala Collections
For Comprehension
How in Scala to find unique items in List
Scala
Converting mutable to immutable map
Scala
Immutability
Mutable
Scala Collections
Why does Scala provide both multiple parameters lists and multiple parameters per list?
Scala
Currying
Partial Application
scala - Any vs underscore in generics
Scala
Generics
Covariance
Any
Existential Type
how to filter out a null value from spark dataframe
Scala
Apache Spark
Apache Spark-Sql
Spark Dataframe
How does Scala's apply() method magic work?
Scala
Syntactic Sugar
Magic Methods
Companion Object
Why "avoid method overloading"?
Scala
Overloading
What is the difference between self-types and trait subclasses?
Scala
Traits
Self Type
Load Scala file into interpreter to use functions?
Scala
Interpreter
Akka in Scala, exclamation mark and question mark
Scala
Operators
Akka
Actor
Is Scala's actors similar to Go's coroutines?
Scala
Go
How to use JDBC source to write and read data in (Py)Spark?
Python
Scala
Apache Spark
Apache Spark-Sql
Pyspark
Case class to map in Scala
Scala
Case Class
What's the difference of the Akka's Actor with Scala's Actor model
Scala
Actor
Akka
Doing HTTP request in Scala
Http
Scala
Scalaz
Get Option value or throw an exception
Scala
Pattern Matching `@` Symbol
Scala
Pattern Matching
Go to next compiler error across project in IntelliJ
Scala
Intellij Idea
How to use Column.isin with list?
Scala
Apache Spark
Apache Spark-Sql
Explicit Type Conversion in Scala
Scala
Type Conversion
How would one do dependency injection in scala?
Scala
Dependency Injection
how do I get sbt to use a local maven proxy repository (Nexus)?
Scala
Maven
Ivy
Nexus
Sbt
How to transform Scala collection of Option[X] to collection of X
Scala
Scala Collections
Scala Option
How can I chain implicits in Scala?
Scala
Implicit Conversion
Implicits
Catching multiple exceptions at once in Scala
Exception
Scala
Exception Handling
Pattern Matching
Try Catch
Scalaz state monad examples
Scala
Scalaz
State Monad
SBT doesn't find file in local maven repository although it's there
Scala
Maven
Sbt
What is the advantage of using abstract classes instead of traits?
Scala
Traits
How do I setup multiple type bounds in Scala?
Generics
Scala
How are the multiple Actors implementation in Scala different?
Scala
Actor
Akka
Simple and concise HTTP client library for Scala
Scala
Http
Scala generic method - No ClassTag available for T
Scala
Generics
Scala 2.10
Querying Spark SQL DataFrame with complex types
Sql
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Is there a scala identity function?
Scala
Functional Programming
Scala Option
Are FP and OO orthogonal?
Oop
Scala
Programming Languages
Functional Programming
Paradigms
How to handle optional query parameters in Play framework
Scala
Playframework
Playframework 2.0
Functional Programming - Lots of emphasis on recursion, why?
Scala
Recursion
Functional Programming
Tail Recursion
How to use third party libraries with Scala REPL?
Scala
Interpreter
Read Eval-Print-Loop
Scala's "for comprehension" with futures
Scala
Future
Use case of scala.concurrent.blocking
Scala
Scala 2.10
Scala - What is the difference between size and length of a Seq?
Scala
Scala 2.10
Seq
How should I think about Scala's Product classes?
Scala
Functional Programming
List of Scala's "magic" functions
Syntax
Scala
Scala's sealed abstract vs abstract class
Scala
Class
Abstract
Sealed
How do you do dependency injection with the Cake pattern without hardcoding?
Scala
How do I compare two arrays in scala?
Arrays
Scala
Pattern Matching
Why is Scala's syntax for tuples so unusual?
Scala
Tuples
Iterable Unpacking
What is the forSome keyword in Scala for?
Scala
Good example of implicit parameter in Scala?
Scala
Parameters
Implicit
How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
Scala
Type Erasure
Doing something before or after all Scalatest tests
Scala
Scalatest
Running tests on Intellij: Class not found
Scala
Intellij Idea
Gradle
Scala 2.8 collections design tutorial
Scala
Scala Collections
Scala 2.8
Scala - printing arrays
Scala
What's the difference between A<:B and +B in Scala?
Scala
Variance
Scala list concatenation, ::: vs ++
List
Scala
Concatenation
Akka Actor not terminating if an exception is thrown
Scala
Routing
Actor
Akka
Fault Tolerance
How do I pattern match arrays in Scala?
Scala
Scala equivalent of java.util.ArrayList
Java
Scala
Arraylist
Can someone explain to me what the Shapeless library is for?
Scala
Shapeless
What is a TypeTag and how do I use it?
Scala
Types
Scala 2.10
Reification
Scala double definition (2 methods have the same type erasure)
Scala
Compilation
Overloading
Typeclass
Type Erasure
What are practical uses of applicative style?
Scala
Haskell
F#
Functional Programming
Applicative
Suitable GUI framework for Scala?
Java
Scala
User Interface
Documenting Scala 2.10 macros
Scala
Macros
Documentation
Scala 2.10
Scala Macros
How to get an Option from index in Collection in Scala?
Scala
Scala Option
When and why should one use Applicative Functors in Scala
Scala
Functional Programming
Applicative
How to insert double quotes into String with interpolation in scala
String
Scala
How to check if path or file exist in Scala
Scala
How does the Cats library in Scala relate to scalaz?
Scala
Scalaz
Scala Cats
Provide schema while reading csv file as a dataframe
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Spark Csv
IntelliJ Cannot Import sbt Project
Scala
Intellij Idea
Import
Sbt
Purpose of Scala's Symbol?
Scala
Syntax
Language Design
Symbols
Literals
Scala: “any” and “all” functions
Scala
Functional Programming
Scala type keyword: how best to use it across multiple classes
Scala
Types
`def` vs `val` vs `lazy val` evaluation in Scala
Scala
Properties
Lazy Evaluation
Setting up scala with IntelliJ
Java
Macos
Scala
Intellij Idea
What's the difference between Unit and Nothing?
Scala
Enforcing Java version for Scala project in sbt?
Java
Scala
Sbt
How do I skip a header from CSV files in Spark?
Scala
Csv
Apache Spark
Scala: pass Seq to var-args functions
Scala
Which programming languages can be used to develop in Android?
Java
Android
Scala
Programming Languages
Scripting
Why does IntelliJ IDEA compile Scala so slowly?
Scala
Intellij Idea
Extending scala case class without constantly duplicating constructors vals?
Scala
Inheritance
What are the problems with an ADT encoding that associates types with data constructors? (Such as Scala.)
Scala
Haskell
Playframework
Functional Programming
Argonaut
What does setMaster `local[*]` mean in spark?
Scala
Apache Spark
Can't push to the heroku
Git
Scala
Heroku
Intellij Idea
Why is appending to a list bad?
Performance
Scala
Functional Programming
How can I easily get a Scala case class's name?
Scala
Class
Classname
Scala: Remove duplicates in list of objects
List
Scala
Duplicates
Design patterns/best practice for building Actor-based system
Scala
Erlang
Actor
In Scala, what is an "early initializer"?
Scala
What is *so* wrong with case class inheritance?
Scala
Inheritance
Case Class
Scala: Boolean to Option
Scala
How can I get the name of an Akka actor from within the actor itself?
Scala
Akka
How to find out which Play version I'm using?
Scala
Playframework
Typesafe Activator
reduceByKey: How does it work internally?
Scala
Apache Spark
Rdd
What is a sealed trait?
Scala
Sealed
Traits
SBT: Start a command line 'run' of the main class of a non-default project
Scala
Sbt
What is the formal difference in Scala between braces and parentheses, and when should they be used?
Scala
Syntax
Parentheses
Braces
Asynchronous IO in Scala with futures
Multithreading
Scala
Io
Future
How to avoid duplicate columns after join?
Scala
Apache Spark
Apache Spark-Sql
Why does join fail with "java.util.concurrent.TimeoutException: Futures timed out after [300 seconds]"?
Scala
Apache Spark
Join
Apache Spark-Sql
Difference between a Seq and a List in Scala
List
Scala
Collections
Seq
What are type classes in Scala useful for?
Scala
Implicit
Difference between fold and foldLeft or foldRight?
Scala
Fold
Akka - How many instances of an actor should you create?
Scala
Akka
How do you remove the _<scala-version> postfix from artifacts built+published with simple-build-tool?
Scala
Sbt
How the get the classOf for a scala object type
Scala
What is the idiomatic scala way of finding, if a given string contains a given substring?
Regex
String
Scala
Substring
Contains
Decomposing tuples in function arguments
Scala
Function
Tuples
What's the current state of static analysis tools for Scala?
Scala
Static Analysis
Sonarqube
Scalastyle
Write to multiple outputs by key Spark - one Spark job
Scala
Hadoop
Output
Hdfs
Apache Spark
Apache Spark logging within Scala
Scala
Logging
Apache Spark
What are the differences between final class and sealed class in Scala?
Scala
Access Modifiers
Ways to make maven build faster?
Java
Multithreading
Scala
Maven
Build
What is monoid homomorphism exactly?
Scala
Haskell
Functional Programming
Category Theory
Monoids
What are all the instances of syntactic sugar in Scala?
Scala
Syntactic Sugar
Canonical way for empty Array in Scala?
Scala
Scala application structure
Scala
Need clarification on Scala literal identifiers (backticks)
Scala
Scala Futures - built in timeout?
Scala
Concurrency
What's recommended .gitignore for Scala/sbt project in IntelliJ IDEA?
Git
Scala
Intellij Idea
Sbt
Spark : how to run spark file from spark shell
Scala
Apache Spark
Cloudera Cdh
Cloudera Manager
What does "coalgebra" mean in the context of programming?
Scala
Haskell
Functional Programming
Category Theory
Recursion Schemes
Does Scala support tail recursion optimization?
Performance
Scala
Tail Recursion
Which programming languages can I use on Android Dalvik?
Java
Python
Android
Scala
Dalvik
Traits and abstract methods override in Scala
Scala
Traits
Does the @inline annotation in Scala really help performance?
Performance
Scala
Scala 2.8
Scala Hoogle equivalent?
Scala
Haskell
Type Systems
In Scala, what does "view" do?
Scala
Future investment: Erlang vs. Scala
Scala
Concurrency
Erlang
Restart elasticsearch node
Java
Scala
Elasticsearch
How to chain multiple different InputStreams into one InputStream
Java
Scala
Io
Inputstream
How to query JSON data column using Spark DataFrames?
Scala
Apache Spark
Dataframe
Apache Spark-Sql
Spark Cassandra-Connector
What are the differences and similarities of Scala and Haskell type systems?
Scala
Haskell
Type Systems
Better String formatting in Scala
String
Scala
Formatting
String Formatting
Read entire file in Scala?
Scala
What is the apply function in Scala?
Scala
Enforce type difference
Scala
Types
What's the Scala way to implement a retry-able call like this one?
Java
Scala
Functional Programming
Scala Functor and Monad differences
Scala
Functional Programming
Can I access my Scala app's name and version (as set in SBT) from code?
Scala
Sbt
Sbt Buildinfo
What are the differences between Scala middleware choices?
Scala
Akka
Spray
Finagle
Min/max with Option[T] for possibly empty Seq?
Scala
Scala Collections
what to choose between require and assert in scala
Scala
How to aggregate values into collection after groupBy?
Scala
Apache Spark
Apache Spark-Sql
Why is "Unable to find encoder for type stored in a Dataset" when creating a dataset of custom case class?
Scala
Apache Spark
Apache Spark-Dataset
Apache Spark-Encoders
How to list all cassandra tables
Scala
Apache Spark
Cassandra
Spark Cassandra-Connector
Akka finite state machine instances
Java
Scala
Akka
State Machine
Building a scala app with maven (that has java source mixed in)
Java
Maven 2
Scala
What does a single apostrophe mean in Scala?
Scala
Actor
Mixing multiple traits in Scala
Scala
Mixins
Traits
Practical examples of using symbols in Scala?
Scala
Symbols
Scala giving me "illegal start of definition"
Scala
Scala equivalent of C#’s extension methods?
Scala
Extension Methods
Is there a dbunit-like framework that doesn't suck for java/scala?
Java
Database
Testing
Scala
Dbunit
Increment (++) operator in Scala
Scala
Increment
How does the “scala.sys.process” from Scala 2.9 work?
Scala
Using Scala traits with implemented methods in Java
Java
Scala
Scala Java-Interop
Nine ways to define a method in Scala?
Scala
Methods
Function
Install sbt on ubuntu
Scala
Debian
Ubuntu 12.04
Sbt
Deb
How can I cast Integer to String in Scala?
Scala
Casting
Any Real-World Experience Using Software Transactional Memory?
Scala
Haskell
Clojure
Language Agnostic
Stm
Scala: how can I sort an array of tuples by their second element?
Arrays
Scala
Sorting
Tuples
High-performance Concurrent MultiMap Java/Scala
Java
Scala
Concurrency
Multimap
What is the Scala equivalent to a Java builder pattern?
Java
Design Patterns
Scala
Is there any way to extend an object?
Scala
How to check to see if a string is a decimal number in Scala
Scala
Do I need to re-use the same Akka ActorSystem or can I just create one every time I need one?
Scala
Akka
Scala's "postfix ops"
Scala
Scala 2.10
How to write database-agnostic Play application and perform first-time database initialization?
Scala
Playframework 2.0
Slick
Scala: Why mapValues produces a view and is there any stable alternatives?
Scala
Map
What is Scala's yield?
Scala
Functional Programming
Yield
Difference between forward and tell in akka actors
Scala
Akka
Actor
Efficiently repeat a character/string n times in Scala
String
Scala
Char
Concatenation
String Concatenation
What is the differences between Int and Integer in Scala?
Scala
Types
Integer
Int
Understanding implicit in Scala
Scala
Syntax
Playframework
Keyword
Get index of current element in a foreach method of Traversable?
Scala
What does "<:" mean in Scala?
Scala
Should implicit classes always extend AnyVal?
Scala
Implicit Conversion
Sets, Functors and Eq confusion
Scala
Haskell
Equality
Functor
How is Akka used in Play?
Scala
Playframework
Akka
Erasure elimination in scala : non-variable type argument is unchecked since it is eliminated by erasure
Scala
Type Erasure
Scala Sets contain the same elements, but sameElements() returns false
Scala
Scala Collections
How to create a Source that can receive elements later via a method call?
Scala
Akka
Akka Stream
Akka Http
Should I use the final modifier when declaring case classes?
Scala
Static Analysis
Case Class
Scala Wartremover
How do you define a local var/val in the primary constructor in Scala?
Scala
Scala Primary-Constructor
What is the meaning of colon, underscore and star in lift's SiteMap(entries:_*)?
Scala
Lift
Difference between Iterator and Stream in Scala?
Scala
Pattern matching with conjunctions (PatternA AND PatternB)
Scala
Pattern Matching
In Scala, how can I subclass a Java class with multiple constructors?
Java
Scala
Constructor
Multiple Constructors
Debunking Scala myths
Scala
Programming Languages
configure run in eclipse for Scala
Eclipse
Scala
How are Scala collections able to return the correct collection type from a map operation?
Scala
Collections
How to check for null in a single statement in scala?
Scala
Null
Inline
Scala pattern matching on sequences other than Lists
Scala
Collections
Pattern Matching
Triple colon Scala
Scala
Unable to find velocity template resources
Java
Scala
Velocity
Scala on iOS using Avian
Iphone
Ios
Scala
Jvm
Avian
How to use java.String.format in Scala?
Java
String
Scala
Format
Difference between case class and case object?
Scala
Akka
Scala recover or recoverWith
Scala
Error Handling
Future
What are the biggest differences between Scala 2.8 and Scala 2.7?
Scala
Calculating the Moving Average of a List
Scala
Functional Programming
Clojure
Scala's '::' operator, how does it work?
List
Scala
Operator Keyword
Replace element in List with scala
Scala
Replace
What is the difference between a var and val definition in Scala?
Scala
How can I get complete stacktraces for exceptions thrown in tests when using sbt and testng?
Scala
Testng
Sbt
Scalatest
Slf4j
In Scala, is there an easy way to convert a case class into a tuple?
Scala
Tuples
Case Class
Finding an item that matches predicate in Scala
Scala
Collections
Idioms
Impredicative types vs. plain old subtyping
Scala
Haskell
Functional Programming
Subtype
Impredicativetypes
Small and good scala projects to learn scala -- especially functional programming and type system
Scala
Functional Programming
Type Systems
Why can a Scala trait extend a class?
Scala
Traits
Finding the index of an element in a list scala
List
Scala
Importing spark.implicits._ in scala
Scala
Apache Spark
aggregate function Count usage with groupBy in Spark
Java
Scala
Apache Spark
Pyspark
Apache Spark-Sql
What are the various join types in Spark?
Scala
Apache Spark
Apache Spark-Sql
Spark Dataframe
Apache Spark-2.0
scala Iterable#map vs. Iterable#flatMap
Scala
Monads
Scala Collections
How can I convert a Java Iterable to a Scala Iterable?
Scala
Scala Java-Interop
Scala equivalent to Python generators?
Python
Scala
Is there an equivalent to SuppressWarnings in Scala?
Scala
Suppress Warnings
Are there any provable real-world languages? (scala?)
Java
Scala
Testing
Functional Programming
Formal Verification
What is the difference between a class and a type in Scala (and Java)?
Java
Class
Scala
Types
Language Design
Can we use match to check the type of a class
Scala
Pattern Matching
Match
hashCode in case classes in Scala
Scala
Hashcode
Case Class
Adding an item to an immutable Seq
List
Scala
Seq
How to generate a list of random numbers?
Scala
Scala UTC timestamp in seconds since January 1st, 1970
Scala
Timestamp
Utc
Printing array in Scala
Arrays
Scala
Scala: Merge map
Scala
Map
Merge
ScalaTest: Assert exceptions in failed futures (non-blocking)
Scala
Scalatest
Scala repl throws error
Java
Scala
Read Eval-Print-Loop