Minor in JS lib: avoid to use undefined literal which may be over overlapped.

js/js.translator/testData/kotlin_lib.js

@@ -41,7 +41,7 @@
             return Kotlin.arrayEquals(obj1, obj2);
         }
 
-        if (typeof obj1 == "object" && obj1.equals_za3rmp$ !== undefined) {
+        if (typeof obj1 == "object" && typeof obj1.equals_za3rmp$ === "function") {
             return obj1.equals_za3rmp$(obj2);
         }
 
@@ -170,7 +170,7 @@
         return Kotlin.createClassNow(base,
                    /** @constructs */
                    function (message) {
-                       this.message = (message !== undefined) ? message : null;
+                       this.message = (message !== void 0) ? message : null;
                    }
                );
     }
@@ -191,7 +191,7 @@
     function throwAbstractFunctionInvocationError(funName) {
         return function () {
             var message;
-            if (funName !== undefined) {
+            if (funName !== void 0) {
                 message = "Function " + funName + " is abstract";
             }
             else {
@@ -283,8 +283,8 @@
 
     Kotlin.Enum = Kotlin.createClassNow(null,
         function () {
-            this.name$ = undefined;
-            this.ordinal$ = undefined;
+            this.name$ = void 0;
+            this.ordinal$ = void 0;
         }, {
             name: function () {
                 return this.name$;
@@ -848,8 +848,8 @@
     };
 
     Kotlin.collectionsSort = function (mutableList, comparator) {
-        var boundComparator = undefined;
-        if (comparator !== undefined) {
+        var boundComparator = void 0;
+        if (comparator !== void 0) {
             boundComparator = comparator.compare.bind(comparator);
         }
 
@@ -887,9 +887,9 @@
             this.string = "";
         }, {
         append: function (obj, from, to) {
-            if (from == undefined && to == undefined) {
+            if (from == void 0 && to == void 0) {
                 this.string = this.string + obj.toString();
-            } else if (to == undefined) {
+            } else if (to == void 0) {
                 this.string = this.string + obj.toString().substring(from);
             } else {
                 this.string = this.string + obj.toString().substring(from, to);

js/js.translator/testData/kotlin_lib_ecma5.js

@@ -383,7 +383,7 @@ var Kotlin = {};
       var obj = {};
       obj.name = name;
       obj.get_za3rmp$ = getFun;
-      if (setFun !== undefined) {
+      if (typeof setFun === "function") {
           obj.set_wn2jw4$ = setFun;
       }
       return obj;

js/js.translator/testData/maps.js

@@ -47,7 +47,7 @@
     }
 
     function hashSetEquals(o) {
-        if (o === null || o === undefined || this.size() !== o.size()) return false;
+        if (o == null || this.size() !== o.size()) return false;
 
         return this.containsAll_4fm7v2$(o);
     }
@@ -511,7 +511,7 @@
             },
             containsKey_za3rmp$: function (key) {
                 // TODO: should process "__proto__" separately?
-                return this.map[key] !== undefined;
+                return this.map[key] !== void 0;
             },
             containsValue_za3rmp$: function (value) {
                 var map = this.map;
@@ -529,15 +529,15 @@
             },
             put_wn2jw4$: function (key, value) {
                 var prevValue = this.map[key];
-                this.map[key] = value === undefined ? null : value;
-                if (prevValue === undefined) {
+                this.map[key] = value === void 0 ? null : value;
+                if (prevValue === void 0) {
                     this.$size++;
                 }
                 return prevValue;
             },
             remove_za3rmp$: function (key) {
                 var prevValue = this.map[key];
-                if (prevValue !== undefined) {
+                if (prevValue !== void 0) {
                     delete this.map[key];
                     this.$size--;
                 }