Hidden performance cost in Scala?

Question

I came across this old question and did the following experiment with scala 2.10.3.

I rewrote the Scala version to use explicit tail recursion:

impor         


        

Answer 1

To make the Java version completely equivalent to your Scala code you need to change it like this.

private int t = 20;


private int t() {
    return this.t;
}

private void run() {
    int i = 10;
    while (!isEvenlyDivisible(2, i, t()))
        i += 2;
    System.out.println(i);
}

It is slower because the JVM can not optimize the method calls.