One method, two languages

sum_multiples.rb

# RUBY METHOD
# -----------------------------------
def sum_multiples(min, max)
  n = (max - 1) / n
  sum = n * (n+1) / 2 * min
end

sum_multiples.scala

// SCALA METHOD
// -----------------------------------
def sum_multiples(min: Int, max: Int) : Int = {
	var n = (max - 1) / min
	var sum = n * (n+1) / 2 * min
	return sum
}

// this is one way to run the method above, passing in numbers as variables
sum_multiples(3, 1000)

The differences:

• Notice that Scala methods are more explicit. They define the type of variable you pass in (in the above case, Integers), as well as what the output is (also an Integer). You don't need to do that in Ruby.
• Also, in Scala you see return sum used. Ruby doesn't need those explicit return statments. Sometimes people might add the following to the Ruby method:

def sum_multiples(min, max)
  n = (max - 1) / n
  sum = n * (n+1) / 2 * min
  sum # note you don't have to type return here. since it's the last thing evaluated in the method it's returned
end

Again, sometimes people explicitly return in Ruby but in Scala I believe it's required.