dosth.cs

private void DoSomething(int number)
{
    for(int i=0; i<=number; i++)
    { 
        if(i%15 == 0)
        {
            Console.WriteLine("InterFace");
        }
        else if (i%3 == 0)
        {
            Console.WriteLine("Inter");
        }
        else if (i%5 == 0)
        {
            Console.WriteLine("Face");
        }
        else
        {
            Console.WriteLine(i.toString());
        }
    }
}

dosth.js

function dosth( a ) { 
  for( i = 0; i <= a; i++ ) {
    if( i % 15 == 0 ) {
      console.log( 'InterFace' );
    } else if( i % 3 == 0 ) {
      console.log( 'Inter' );
    } else if( i % 5 == 0 ) {
      console.log( 'Face' );
    } else {
      console.log( i );
    }
  }
}

DoSomething(5)

InterFace
1
2
Inter
4
Face 

DoSomething(10)

InterFace
1
2
Inter
4
Face
Inter
7
8
Inter
Face