Check String Permutation
Given two strings, write a method to decide if ones is a permutation of the other
import scala.collection.mutable.Map
def isPermutation(s1: String, s2: String): Boolean = {
if (s1.length != s2.length) false
else if (s1.isEmpty) true
else {
val charMap = Map[Char, Int]() withDefaultValue 0
for (i <- 0 until s1.length; j <- 0 until s2.length) {
charMap(s1(i)) += 1
charMap(s2(j)) -= 1
}
charMap.values.forall(_ == 0)
}
}
isPermutation("", "")
isPermutation("abcd", "dcba")
isPermutation("abcd", "ecba")
