exploratory FizzBuzz in Scala

Runner.scala

import scala.collection.mutable.ArrayBuffer

object Runner {
	def main(args: Array[String]) {
		// printFizzBuzz(20)
		
		val max = 20
		val factorsAndWords = Map(3 -> "Fizz", 5 -> "Buzz")
		printGenericFizzBuzz(max, factorsAndWords)
	}
	
	def printFizzBuzz(max: Int): Unit = {
		for (num <- 1 to max) {
			if (isDivisible(num, 3) || isDivisible(num, 5)) {
				if (isDivisible(num, 3))
					print("Fizz")
				if (isDivisible(num, 5))
					print("Buzz")
			} else {
				print(num)
				// Is there a way to call print without parens, like `print "something"`? If not, why not?
			}
			println()
		}
	}
	
	def printGenericFizzBuzz(max: Int, factorsAndWords: Map[Int, String]) : Unit = {
		// uses algorithm from http://news.ycombinator.com/item?id=4614757
		
		for (num <- 1 to max) {
			var specialSyllables = ArrayBuffer[String]()
			for ((factor, word) <- factorsAndWords) {
				if (isDivisible(num, factor))
					specialSyllables.append(word)
			}
			// after getting constructing specialSyllables working, rewrite that code to be immutable
			// by using fold (reduce) starting with an empty map
			
			if (specialSyllables.size > 0) {
				print(specialSyllables.mkString)
			} else {
				print(num)
			}
			println()
		}
	}
	
	// can I make this callable like `15 isDivisibleBy 5`?
	// can I somehow write Int once to indicate that all parameters are Ints?
	def isDivisible(number: Int, factor: Int) = {
		number % factor == 0
	}
	
	// function return values can be inferred, so I will probably be able to leave it out
	def fizzBuzzStream(max: Int): Unit = {
		// try to return a stream or "generator" that can be printed as the results are calculated
		// perhaps the "for ... yield" syntax will help
	}
	
	// def printIntGenerator(generator: Generator[Int]) {
		
	// }
}