log

(log number)

Returns the natural logarithm (base e) of number as a float. Only the one-argument form is supported -- there is no (log number base) form for an arbitrary base. The interpreter and JVM backends compute it with Math.log; the WASM backend uses a software approximation (exponent extraction plus a polynomial series), so its result may differ slightly in the least significant digits. The IEEE edges match everywhere: (log 0.0) is -Infinity, a negative argument gives NaN.