cfunction
src/core/io.c on line 628, column 1
(xprinf to fmt & xs)
Like `prinf` but prints to an explicit file or value `to`. Returns
nil.
(def b @"")
(def v (* 1000 (math/random)))
# => 487.181 your number can differ
(xprinf b "Value reached level %f" v)
# => nil
b
# => @"Value reached level 487.181188"