clxn (pronounced "collection")

Import in SBT:

libraryDependencies ++= Seq(
  "default" % "clxn_2.13" % "0.1.0" // temporary coordinates, moving to jcenter shortly
)

Clxn is a library that contains extra functionality for the Scala Standard Library Collections. Currently, the only module available is the unsafewrap module, described below.

Features

unsafewrap

The com.github.joshlemer.clxn.unsafewrap package provides decorators to allow the wrapping of mutable and unknown-mutability collections (things in the scala.collection package) in immutable wrappers. This is the fastest way to convert a mutable collection into an immutable one, for cases where performance matters, as it involves no copying but instead just wraps a mutable collection in an immutable facade.

Example usage:

import com.github.joshlemer.clxn.unsafewrap._

import collection.immutable.{SeqMap, SortedMap, SortedSet}
import scala.collection.mutable

// wrap a mutable collection in an immutable wrapper
val seq1: Seq[Int] = Seq.unsafeWrap(mutable.ArrayBuffer(1,2,3)) 

// also works for collections of unknown mutability, or even immutable collections
val seq2: Seq[Int] = Seq.unsafeWrap(List(1,2,3) : collection.Seq[Int]) 

// if the collection passed for wrapping is already immutable, no wrapping is applied. 
// the passed collection is returned
val seq3: Seq[Int] = Seq.unsafeWrap(List(1,2,3)) // List(1,2,3)


// also convert Sets, Maps, SeqMaps, SortedMaps, SortedSets, and plain old Iterabls
val set: Set[Int] = Set.unsafeWrap(mutable.HashSet(1,2,3))

val map: Map[Int, String] = Map.unsafeWrap(mutable.HashMap(1 -> "hi"))

val seqMap: SeqMap[Int, String] = SeqMap.unsafeWrap(mutable.LinkedHashMap(1 -> "hi"))

val sortedMap: SortedMap[Int, String] = SortedMap.unsafeWrap(mutable.TreeMap(1 -> "hi"))

val sortedSet: SortedSet[Int] = SortedSet.unsafeWrap(mutable.TreeSet(1))

val iterable: Iterable[Int] = Iterable.unsafeWrap(mutable.ArrayBuffer(1,2,3))