A library that contains scala collection utility classes. A fork and new home of the now unmaintained Gilt Foundation Classes (com.gilt.gfc), now called the GFC Collective, maintained by some of the original authors.

The latest version is 1.0.0, released on 21/Jan/2020 and cross-built against Scala 2.12.x and 2.13.x.

If you're using SBT, add the following line to your build file:

libraryDependencies += "org.gfccollective" %% "gfc-collection" % "1.0.0"

For Maven and other build tools, you can visit search.maven.org. (This search will also list other available libraries from the GFC Collective.)

Simple non-thread-safe circular buffer implementation that supports adding a new item, finding the oldest item, the newest item, or iterating from oldest to newest.

val buffer = new CircularBuffer[Int](5)

buffer.add(0)
assert(buffer.oldest == 0)
assert(buffer.newest == 0)
assert(buffer.size == 1)

(1 to 4).foreach(buffer.add(_))
assert(buffer.oldest == 0)
assert(buffer.newest == 4)
assert(buffer.size == 5)

buffer.add(5)
assert(buffer.oldest == 1)
assert(buffer.newest == 5)
assert(buffer.size == 5)

Utility to select top N items from a collection.

val numbers = scala.util.Random.shuffle(0 to 1000)
assert(TopN(5, numbers) == Seq(0, 1, 2, 3, 4))
assert(TopN(5, numbers)(scala.math.Ordering.Int.reverse) == Seq(1000, 999, 998, 997, 996))

Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0