1 'abc'.lastIndexOf('a', 4) = 0
   2 'abc'.lastIndexOf('b', Infinity) = 1
   3 'abc'.lastIndexOf('a', -1) = 0
   4 'abc'.lastIndexOf('a', -Infinity) = 0
   5 'oracle'.lastIndexOf('u') = -1
   6 'hello'.lastIndexOf('l') = 3
   7 'hello'.lastIndexOf('l', 2) = 2
   8 'hello'.lastIndexOf('l', 3) = 3
   9 'hello'.lastIndexOf('l', 1) = -1