(print-str & xs)
print to a string, returning it
;; Create a string from the given items and store it in x.
user=> (def x (print-str 1 "foo" \\b \\a \\r {:a 2}))
#'user/x
;; It's a string.
user=> (string? x)
true
;; Notice that each item is separated by a space.
user=> x
"1 foo b a r {:a 2}"