A better way of concatenating thousands of rows than using case when [duplicate]

This question already has an answer here:

• How to make a query with group_concat in sql server 4 answers

I have a table with thousands of rows (unique at ID-code level) that is constructed like:

ID           Code            Description
1             123               A
1             789               B
2             789               B
2             123               A
2             a1b2              C
3             101               D
4             102               F

I need it to look like:

ID    Description
1        A,B
2        B,A,C
3        D
4        F

Currently I am using mulitple case when conditions that look like:

max(Case when Code='123' then (description)+',' else '')+
max(Case when Code='789' then (description)+',' else '')+

etc.

Group by ID

Is there a faster way of doing this? I have been advised that using a stuff function may be viable, but honestly I can't see how a stuff function would save me any lines of code

via Chebli Mohamed