how to make underscore js map() working with IE8

I was bother by a bug since yesterday. It took me sometime to figure out the cause of an IE 8 error (yeah, IE again!!). It turned out it was the map() function from underscore js which made IE 8 throwing error. I have checked on IE 10 , there was no such problem!

The code IE8 didn't like was

var totalValues = _.pluck(result, "totalValues").map(format);  //format is a function

 After some testing and googling, I found the solution to be 

var totalValues = _.map(_.pluck(result, "totalValues"), format);

Previous I was complaining why there were so many syntax in underscore js to do the same thing. Now I know the reason. It is always the problematic IE! I really have to thank Microsoft constantly reminds me and all the non tech people how valuable a tech person is in the world of IE!