Dynamic path names

Hi all, just a quick question.

var exact = front.slice(37, front.length-7);
var introductionNumber = 4;

Exact is a dynamic variable, so I need to use the [] for the path name.

My question is, how can I get “trace([exact+“Number”]);” to trace “4”, just like “introductionNumber”? 'Cause right now [exact+“Number”] is just tracing as “introductionNumber”, not"4".

Thanks in advance.