How to convert an Int to a String of a given length with leading zeros to align?

Question

How can I convert an Int to a 7-character long String, so that 123 is turned into \"0000123\"?

Answer 1

The padding is denoted by %02d for 0 to be prefixed to make the length 2:

scala> val i = 9 
i: Int = 9

scala> val paddedVal = f"${num}%02d"
paddedVal: String = 09

scala> println(paddedVal)             
09