Method log

rhino/src/main/java/org/mozilla/javascript/NativeMath.java:468–474

(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args)

    }

    private static Object log(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {
        double x = ScriptRuntime.toNumber(args, 0);
        // Java's log(<0) = -Infinity; we need NaN
        x = (x < 0) ? Double.NaN : Math.log(x);
        return ScriptRuntime.wrapNumber(x);
    }

    private static Object log1p(
            Context cx, JSFunction f, Object nt, VarScope s, Object thisObj, Object[] args) {