chore: resolve codeclimate issues

Author: mav-rik

src/ignoreAttributes.js

@@ -1,4 +1,4 @@
-module.exports = function (ignoreAttributes) {
+function getIgnoreAttributesFn(ignoreAttributes) {
     if (typeof ignoreAttributes === 'function') {
         return ignoreAttributes
     }
@@ -15,4 +15,6 @@ module.exports = function (ignoreAttributes) {
         }
     }
     return () => false
-}
+}
+
+module.exports = getIgnoreAttributesFn

src/xmlbuilder/json2xml.js

@@ -103,11 +103,9 @@ Builder.prototype.j2x = function(jObj, level, ajPath) {
     } else if (typeof jObj[key] !== 'object') {
       //premitive type
       const attr = this.isAttribute(key);
-      if (attr) {
-        if (!this.ignoreAttributesFn(attr, jPath)) {
-          attrStr += this.buildAttrPairStr(attr, '' + jObj[key]);
-        }
-      }else {
+      if (attr && !this.ignoreAttributesFn(attr, jPath)) {
+        attrStr += this.buildAttrPairStr(attr, '' + jObj[key]);
+      } else if (!attr) {
         //tag value
         if (key === this.options.textNodeName) {
           let newval = this.options.tagValueProcessor(key, '' + jObj[key]);