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A Range is an ordered sequence of integers that are equally spaced apart. For example, "1, 2, 3," is a range, as is "5, 8, 11, 14." To create a range in Scala, use the predefined methods to and by.
scala> 1 to 3
res2: scala.collection.immutable.Range.Inclusive
with scala.collection.immutable.Range.ByOne = Range(1, 2, 3)
scala> 5 to 14 by 3
res3: scala.collection.immutable.Range = Range(5, 8, 11, 14)
If you want to create a range that is exclusive of its upper limit, then use the convenience method until instead of to:
scala> 1 until 3
res2: scala.collection.immutable.Range.Inclusive
with scala.collection.immutable.Range.ByOne = Range(1, 2)
Ranges are represented in constant space, because they can be defined by just three numbers: their start, their end, and the stepping value. Because of this representation, most operations on ranges are extremely fast.
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| | | Ranges | Contents |