Hi,

I have a strange problem with the following code:

@Js
class TestClass
{
  Void main()
  {
    echo(get.toFloat.log10.toInt)
    echo(1000.toFloat.log10.toInt)
  }

  Int get() { 1000 }
}

In the browser console (the same for Firefox and Chrome) I have: 2 3

However in java it works fine. Do you have any ideas?

JavaScript does not have a native log10 method so we have to use division to approximate which appears is causing the precision issues you are seeing:

Math.log(1000) / Math.LN10  =>  2.9999999999999996  (Chrome)

Float.toInt uses Math.floor to convert to Int. So you should be seeing 2 for both the above cases (which will differ than the JVM which produces 3).

Should there be an integer logarithm?

In the meantime you could use something like:

int iLog10(int x)
{
   if (x <= 0)
      throw ...

   i := -1
   m := 1
   while (x >= m)
   {
      m *= m
      i += 1
   }
   return i
}