10000 Implement ListBuffer.isEmpty / nonEmpty / head efficiently by jrudolph · Pull Request #5802 · scala/scala · GitHub
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Implement ListBuffer.isEmpty / nonEmpty / head efficiently #5802

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Mar 30, 2017
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Implement ListBuffer.isEmpty / nonEmpty / head efficiently #5802

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4 changes: 4 additions & 0 deletions src/library/scala/collection/mutable/ListBuffer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,10 @@ final class ListBuffer[A]
// Don't use the inherited size, which forwards to a List and is O(n).
override def size = length

// Override with efficient implementations using the extra size information available to ListBuffer.
override def isEmpty: Boolean = len == 0
override def nonEmpty: Boolean = len > 0

// Implementations of abstract methods in Buffer

override def apply(n: Int): A =
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