cfunction
src/core/io.c on line 671, column 1
(xprintf to fmt & xs)
Like `printf` but prints to an explicit file or value `to`. Returns
nil.
(def b @"")
(def v (* 1000 (math/random)))
# => 912.753 can differ for you
(xprintf b "Value reached level %f" v)
# => nil
b
# => @"Value reached level 912.752790\n"