.partition()

.partition() takes a string parameter and returns two new strings. The first new string contains those characters that satisfy a supplied predicate, and the second new string contains those that do not satisfy that predicate.

A predicate takes an argument and returns a boolean true or false. If true is returned, the argument is said to satisfy the predicate. Otherwise, the argument does not satisfy the predicate.

Syntax

xString.partition(xPredicate)

• xString: Supplies the string to be partitioned.
• xPredicate: Supplies the predicate that partitions the value of xString.

Example

The following example uses the character method .isUpperCase() as the predicate within .partition() to partition a string into uppercase letter characters and other characters:

fun main () {
  val sampleString = "AbCd12/"
  println(sampleString.partition(){it.isUpperCase()})
}

The above example results in the following output:

(AC, bd12/)