Fix initialization

Author: medikoo

polyfill.js

@@ -27,7 +27,7 @@ module.exports = MapPoly = function (/*iterable*/) {
 		__mapKeysData__: d('c', keys = []),
 		__mapValuesData__: d('c', values = [])
 	});
-	if (!iterable) return;
+	if (!iterable) return self;
 	forOf(iterable, function (value) {
 		var key = validValue(value)[0];
 		value = value[1];

primitive/index.js

@@ -32,7 +32,7 @@ module.exports = PrimitiveMap = function (/*iterable, serialize*/) {
 		__mapValuesData__: d('c', create(null)),
 		__size__: d('w', 0)
 	});
-	if (!iterable) return;
+	if (!iterable) return self;
 	forOf(iterable, function (value) {
 		var key = validValue(value)[0], sKey = self._serialize(key);
 		if (sKey == null) throw new TypeError(key + " cannot be serialized");

test/polyfill.js

@@ -51,4 +51,10 @@ module.exports = function (T, a) {
 	a(map.size, 0, "Clear: size");
 	a(map.has('trzy'), false, "Clear: has");
 	a.deep(toArray(map), [], "Clear: Values");
+
+	a.h1("Empty initialization");
+	map = new T();
+	map.set('foo', 'bar');
+	a(map.size, 1);
+	a(map.get('foo'), 'bar');
 };

test/primitive/index.js

@@ -50,4 +50,10 @@ module.exports = function (T, a) {
 	a(map.size, 0, "Clear: size");
 	a(map.has('trzy'), false, "Clear: has");
 	a.deep(toArray(map.values()), [], "Clear: Values");
+
+	a.h1("Empty initialization");
+	map = new T();
+	map.set('foo', 'bar');
+	a(map.size, 1);
+	a(map.get('foo'), 'bar');
 };