How do I separate text with ","?

Hi,

I have there objects with different ID(apple, banana, orange), when I touch on each one, I want to append the text with each one's name, like: on touch objects--> append text with ","&objects.ID, but the problem is the first ID that append to text should not have ",", but the rest should have. Please help, thanks

Something like adding these conditions?

text.text is not equal to ""

append : ","&objects.ID

--else

append ; objects.ID

forget to add condition thanks