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    <p>Not an array, but here's a one-based immutable IndexedSeq implementation that I recently put together. I followed the example given <a href="http://docs.scala-lang.org/overviews/core/architecture-of-scala-collections.html" rel="nofollow">here</a> where they implement an RNA class. Between that example, the ScalaDocs, and lots of "helpful" compiler errors, I managed to get it set up correctly. The fact that OneBasedSeq is genericized made it a little more complex than the RNA example. Also, in addition to the traits extended and methods overridden in the example, I had to extend <code>IterableLike</code> and override the <code>iterator</code> method, because various methods call that method behind the scenes, and the default iterator is zero-based.</p> <p>Please pardon any stylistic or idiomadic oddities; I've been programming in Scala for less than 2 months.</p> <pre><code>import collection.{IndexedSeqLike, IterableLike} import collection.generic.CanBuildFrom import collection.mutable.{Builder, ArrayBuffer} // OneBasedSeq class final class OneBasedSeq[T] private (s: Seq[T]) extends IndexedSeq[T] with IterableLike[T, OneBasedSeq[T]] with IndexedSeqLike[T, OneBasedSeq[T]] { private val innerSeq = s.toIndexedSeq def apply(idx: Int): T = innerSeq(idx - 1) def length: Int = innerSeq.length override def iterator: Iterator[T] = new OneBasedSeqIterator(this) override def newBuilder: Builder[T, OneBasedSeq[T]] = OneBasedSeq.newBuilder override def toString = "OneBasedSeq" + super.toString } // OneBasedSeq companion object object OneBasedSeq { private def fromSeq[T](s: Seq[T]) = new OneBasedSeq(s) def apply[T](vals: T*) = fromSeq(IndexedSeq(vals: _*)) def newBuilder[T]: Builder[T, OneBasedSeq[T]] = new ArrayBuffer[T].mapResult(OneBasedSeq.fromSeq) implicit def canBuildFrom[T, U]: CanBuildFrom[OneBasedSeq[T], U, OneBasedSeq[U]] = new CanBuildFrom[OneBasedSeq[T], U, OneBasedSeq[U]] { def apply() = newBuilder def apply(from: OneBasedSeq[T]): Builder[U, OneBasedSeq[U]] = newBuilder[U] } } // Iterator class for OneBasedSeq class OneBasedSeqIterator[T](private val obs: OneBasedSeq[T]) extends Iterator[T] { private var index = 1 def hasNext: Boolean = index &lt;= obs.length def next: T = { val ret = obs(index) index += 1 ret } } </code></pre>
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    1. POExtending Scala collections: One based Array index exercise
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    1. USKarl von L
    1. USKarl von L
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