String

val str: String = "abcde,efg"

Scala accesses the String class of Java.

Useful functions

• charAt: str.charAt(1) returns b.

• subString: str.subString(1, 3) returns bc.

• split: str.split(",") returns a list which contains abcd and efg.

• startWith: str.startWith("abc") returns true.

• replace: str.replace(",", ";") returns abcde;efg.

• toLowerCase and toUpperCase

Interpolation

val name: String = "Jack"
val age: Int = 5

• s interpolator

  val message = s"It's $name. I'll be turning ${age + 1} years old."
  

• f interpolator: It can define the format.

  val speed: Float = 1.2f
  val message = f"$name%s's speed is $speed%2.2f meters per hour."
  

• raw interpolator

  val rawTxt = raw"change line \n"