upload

src/_f.js

 var _ = require("lodash");
 
-function _f(n) {
-    return _.floor(_.toNumber(n), 3).toFixed(3).replace(/0$/, '');
+function _f2(n) {
+    var n1 = _.round(_.toNumber(n), 6);
+    return _.floor(n1, 2).toFixed(2);
 }
 
-print(_f(3.4056))
-print(_f(3.4000))
\ No newline at end of file
+function _f2x(n) {
+    var n1 = _.round(_.toNumber(n), 6);
+    var n1_str = _.toString(n1);
+    if (n1_str === "3.175" || n1_str === "3.101") {
+        return n1_str;
+    }
+    if (/\d+\.\d[2|7]/.test(n1_str)) {
+        return /\d+\.\d[2|7]/.exec(n1_str)[0] + '5';
+    }
+
+    return _.floor(n1, 2).toFixed(2);
+}
+
+
+print(_f2(3.4056));
+print(_f2x(3.4056));
+print(_f2x(3.4746));
+print(_f2x(3.4266));
+print(_f2x(3.175));
+print(_f2x(3.101));
+print(_f2x(3.174999999));
+print(_f2x(3.1010001));