concat returns a string of all elements in a vector glued together with a
common string, for example (concat "x" ["1" "2" "3"]) == "1x2x3". The glue
can be left empty, but must be a string. Only vectors are supported for
concatenation.
concat accepts more than 1 value for the source of strings to concatenate,
for example (concat "glue" "a" "b" "c") == "agluebgluec". Strings are taken
as they are, vectors are unpacked (not recursively) and must contain only strings.
(concat "," ["1" "2" "3"])➜"1,2,3"(concat "" ["1" "2" "3"])➜"123"(concat "," [])➜""(concat "," "a" "b")➜"a,b"(concat "," "a" ["b" "c"] "d" [] "e")➜"a,b,c,d,e"(concat "," "a" [["b"]])➜ invalid
glueis an arbitrary expression that evaluates to a string.elementis 1 or more arbitrary expressions that each evaluate to a string or a vector containing only strings.
concat combines all elements using the glue string. Each element can be either
a string or a vector. Vectors are only flattened to one level and must contain
only values that coalesce into strings. Empty vectors add nothing to the result.
concat executes glue and each element in their own contexts, so nothing is
shared.