Javascropt Eval() function with semi-colon seperated

function use_of_eval_method()
{
   eval('40;(20/5);65;90+20');
}

The output of above statement is 110. So point here is if we pass semi-colon separated mathematical expressions to eval function in Javascript then it would return the value of the last evaluated expression. So in our case the answer would be 90+20 = 110.