Scala FAQ: How can I format numbers and currency in Scala, such as to control the number of decimal places and commas in the values, typically for printed output.
For basic number formatting, use the
f string interpolator shown in Recipe 1.4 of the Scala Cookbook, “Substituting Variables into Strings”:
scala> val pi = scala.math.Pi pi: Double = 3.141592653589793 scala> println(f"$pi%1.5f") 3.14159
A few more examples demonstrate the technique: