gilt / gfc-collection

A library that contains Scala collection utility classes

Version Matrix

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A library that contains scala collection utility classes. Part of the Gilt Foundation Classes.

Getting gfc-collection

The latest version is 0.0.5, which is cross-built against Scala 2.10.x, 2.11.x and 2.12.x.

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

libraryDependencies += "com.gilt" %% "gfc-collection" % "0.0.5"

For Maven and other build tools, you can visit (This search will also list other available libraries from the gilt fundation classes.)

Contents and Example Usage


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)

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)

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))


Copyright 2018 Gilt Groupe, Inc.

Licensed under the Apache License, Version 2.0: