Add {Map,Set}::FromArray to the API

src/collection.js

Index: src/collection.js
diff --git a/src/collection.js b/src/collection.js
index eddf0f32655f1ed0be27c2a496c2a803e09d4391..00a14aa77c1347592d0f8481da4c5b0d4b410f6f 100644
--- a/src/collection.js
+++ b/src/collection.js
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+var $mapFromArray;
+var $setFromArray;
+
 (function(global, shared, exports) {
 
 "use strict";
@@ -437,4 +440,23 @@ $installFunctions(GlobalMap.prototype, DONT_ENUM, [
   "forEach", MapForEach
 ]);
 
+$mapFromArray = function(array) {
+  var map = new GlobalMap;
+  var length = array.length;
+  for (var i = 0; i < length; ++i) {
+    var entry = array[i];
+    %_CallFunction(map, entry[0], entry[1], MapSet);
+  }
+  return map;
+}

[arv (Not doing code reviews), 2015/05/26 16:37:40]

;

[adamk, 2015/05/26 17:27:45]

Done.

+
+$setFromArray = function(array) {
+  var set = new GlobalSet;
+  var length = array.length;
+  for (var i = 0; i < length; ++i) {
+    %_CallFunction(set, array[i], SetAdd);
+  }
+  return set;
+}

[arv (Not doing code reviews), 2015/05/26 16:37:40]

;

[adamk, 2015/05/26 17:27:45]

Done.

+
 })