+
+intercalate :: String -> [String] -> String
+intercalate separator strings = do
+ l = length strings
+ if l == 0
+ then ""
+ else if l == 1
+ then strings!0
+ else runProc do
+ sb = StringBuilder.new
+ sb << strings!0
+ loop i | i == l = ()
+ | otherwise = do
+ sb << separator << strings!i
+ loop (i+1)
+ loop 1
+ StringBuilder.toString sb
+