cljs.math/log1p

functionsince v1.11.50Edit
(log1p x)

Source docstring:
Returns ln(1+x). For small values of x, log1p(x) is more accurate than
log(1.0+x).
If x is ##NaN or ##-Inf or < -1 => ##NaN
If x is -1 => ##-Inf
If x is ##Inf => ##Inf
See: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log1p
Source code @ clojurescript:src/main/cljs/cljs/math.cljs
(defn ^number log1p
  {:added "1.11.10"}
  [x] (Math/log1p x))