是否存在一个带有小数步长的Scala“范围”方法（类似于Python）？

Question

This works:

scala> 0 to 24 by 5
res16: scala.collection.immutable.Range = Range(0, 5, 10, 15, 20)

Negative integer works, too:

scala> 0 to 24 by -1
res17: scala.collection.immutable.Range = Range()

Demands an integer:

scala> 0 to 24 by 0.5

<console>:40: error: type mismatch;
 found   : Double(0.5)
 required: Int
              0 to 24 by 0.5
                         ^

Answer 1

Explicitly define a range of Double s:

scala> 0.0 to 24.0 by 0.5
// res0: scala.collection.immutable.NumericRange[Double] = NumericRange(0.0, 0.5, 1.0, ...)

A Range works with Int only. NumericRange is a more generic version of Range that allows one to define a fractional (ie, of type Double ) step.