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Clarify introduction to "Ranges" #85

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May 19, 2017
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Clarify introduction to "Ranges" #85

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6 changes: 4 additions & 2 deletions src/main/scala/stdlib/Ranges.scala
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Expand Up @@ -12,9 +12,11 @@ import org.scalatest._
*/
object Ranges extends FlatSpec with Matchers with org.scalaexercises.definitions.Section {

/** 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`. `1 to 3` generates `Range(1, 2, 3)` and `5 to 14 by 3` generates `Range(5, 8, 11, 14)`.
/** 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`, `until`, and `by`. `1 to 3` generates "1, 2, 3" and `5 to 14 by 3` generates "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`: `1 until 3` generates `Range(1, 2)`.
* If you want to create a range that is exclusive of its upper limit, then use `until` instead of `to`: `1 until 3` generates "1, 2".
*
* Note that `Range(a, b, c)` is the same as `a until b by c`
*
* 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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