\DOC commafy

\TYPE {commafy : string list -> string list}

\SYNOPSIS
Add commas into a list of strings.

\KEYWORDS
string.

\DESCRIBE
An application {commafy [s1,...,sn]} yields {[s1, ",", ..., ",", sn]}.

\FAILURE
Never fails.

\EXAMPLE
{
- commafy ["donkey", "mule", "horse", "camel", "llama"];
> val it =
    ["donkey", ", ", "mule", ", ", "horse", ", ", "camel", ", ", "llama"] :
  string list

- print (String.concat it ^ "\n");
donkey, mule, horse, camel, llama
> val it = () : unit

- commafy ["foo"];
> val it = ["foo"] : string list
}


\ENDDOC