diff --git a/src/parser.js b/src/parser.js
index 9f90f0a..831b5cf 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -82,7 +82,7 @@ class Parser {
   parseBrowser() {
     this.parsedResult.browser = {};
 
-    const browserDescriptor = Utils.find(browserParsersList, _browser => {
+    const browserDescriptor = Utils.find(browserParsersList, (_browser) => {
       if (typeof _browser.test === 'function') {
         return _browser.test(this);
       }
@@ -165,7 +165,7 @@ class Parser {
   parseOS() {
     this.parsedResult.os = {};
 
-    const os = Utils.find(osParsersList, _os => {
+    const os = Utils.find(osParsersList, (_os) => {
       if (typeof _os.test === 'function') {
         return _os.test(this);
       }
@@ -241,7 +241,7 @@ class Parser {
   parsePlatform() {
     this.parsedResult.platform = {};
 
-    const platform = Utils.find(platformParsersList, _platform => {
+    const platform = Utils.find(platformParsersList, (_platform) => {
       if (typeof _platform.test === 'function') {
         return _platform.test(this);
       }
@@ -292,7 +292,7 @@ class Parser {
   parseEngine() {
     this.parsedResult.engine = {};
 
-    const engine = Utils.find(enginesParsersList, _engine => {
+    const engine = Utils.find(enginesParsersList, (_engine) => {
       if (typeof _engine.test === 'function') {
         return _engine.test(this);
       }
@@ -380,7 +380,10 @@ class Parser {
         }
       }
 
-      const platformMatchingDefinition = Utils.find(platformsAndOSNames, name => (this.isPlatform(name)));
+      const platformMatchingDefinition = Utils.find(
+          platformsAndOSNames,
+          name => (this.isPlatform(name))
+        );
       if (platformMatchingDefinition) {
         const platformResult = this.satisfies(platformsAndOSes[platformMatchingDefinition]);
 
diff --git a/src/utils.js b/src/utils.js
index f1d82d7..cdf76e1 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -244,11 +244,14 @@ export default class Utils {
     if (Array.prototype.find) {
       return Array.prototype.find.call(arr, predicate);
     }
-    for (i = 0, l = arr.length; i < l; i++ ) {
+    for (i = 0, l = arr.length; i < l; i+=1) {
       const value = arr[i];
-      if (!predicate(value, i)) continue;
+      if (!predicate(value, i)) {
+        continue;
+      }
       return value;
     }
+    return undefined;
   }
 
   /**
@@ -258,19 +261,19 @@ export default class Utils {
    * @param  {Object} ...objs
    * @return {Object}
    */
-  static assign(obj) {
+  static assign(obj, ...assigners) {
     let i;
     let l;
-    let k;
     if (Object.assign) {
-      return Object.assign.apply(Object, arguments);
+      return Object.assign(obj, ...assigners);
     }
-    for (i = 1, l = arguments.length; i < l; i++) {
-      const assigner = arguments[i];
-      if (typeof assigner !== "object") continue;
-      for (k in assigner) {
-        obj[k] = assigner[k]
+    for (i = 0, l = assigners.length; i < l; i+=1) {
+      const assigner = assigners[i];
+      if (typeof assigner !== 'object') {
+        continue;
       }
+      const keys = Object.keys(assigner);
+      keys.forEach(key => obj[key] = assigner[key]);
     }
     return obj;
   }