Equivalent of Perl 'join' ?

[CdeMills]

Hello,

I'm missing a Perl feature. The join function works as follows:
   join EXPR,LIST
               Joins the separate strings of LIST into a single string with
               fields separated by the value of EXPR, and returns that new
               string. 

The EXPR is inserted at each intermediate place. I would like to have such a
function to emit on a single line all the elements of a string array,
separated by commas. Before starting writing my own implementation, is there
an equivalent ?

Regards

Pascal
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