While Clojure does not have a native tracing feature, there is a package that provides useful tracing features.
First, load the file of tracing functions:
Wrapping a function call in (trace ...) will generate a trace printout of the value of that call.
user=> (trace (* 2 3)) TRACE: 6 6
To trace a function, redefine the function using deftrace rather than defn. To remove the trace, redefine the function with defn.
(deftrace factorial [n] (if (= n 0) 1 (* n (factorial (- n 1))))) user=> (factorial 4) TRACE t256: (factorial 4) TRACE t257: | (factorial 3) TRACE t258: | | (factorial 2) TRACE t259: | | | (factorial 1) TRACE t260: | | | | (factorial 0) TRACE t260: | | | | => 1 TRACE t259: | | | => 1 TRACE t258: | | => 2 TRACE t257: | => 6 TRACE t256: => 24 24The first set of lines show the recursive calls to the factorial function with argument values; the lines with => show the result of each call at the corresponding level of indentation.