Anonymous user
Balanced brackets: Difference between revisions
→Scala Version 2
Line 4,031:
}</lang>
Alternate implementation of "isBalanced" using tail-recursion instead of var and return:
<lang scala>
def isBalanced(str: String): Boolean = isBalanced(str.toList, balance = 0)
@tailrec
def isBalanced(str: List[Char], balance: Int = 0): Boolean =
str match {
case _ if (balance < 0) => false
case Nil => balance == 0
case char :: rest =>
val newBalance = char match {
case '[' => balance + 1
case ']' => balance -1
}
isBalanced(rest, newBalance)
}
</lang>
Sample output:
| |||