Remove Last Comma from a string

Question

Using JavaScript, how can I remove the last comma, but only if the comma is the last character or if there is only white space after the comma? This is my code. I got a wor

Answer 1

In case its useful or a better way:

str = str.replace(/(\s*,?\s*)*$/, "");

It will replace all following combination end of the string:

1. ,
2. , 
3. ,  ,  , ,   ,
4. 
5. ,
6. ,