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Programming Puzzle: What is the best way to format a comma delimited list?

Fri, 2009-02-13 12:37 — jason

Say you have a list, array, vector, storage format doesn't matter:

std::vector<int> vec;
vec.push_back(1);
vec.push_back(17);
vec.push_back(9);

And you want to format this list into a comma delimited string without the trailing comma, what is the best way to do this?

Example output:

1,17,9

In any language, with any list type. Post your answers here. Be sure to use code formatting for your answer, to make it easier for everyone to read.

<code language="lua">
--my code solution
</code>

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