Fixes jashkenas#603. Adds an _.zipObject() function.

test/arrays.js

@@ -123,6 +123,12 @@ $(document).ready(function() {
     equal(String(stooges), 'moe,30,true,larry,40,,curly,50,', 'zipped together arrays of different lengths');
   });
 
+  test('arrays: zipObject', function() {
+    var result = _.zipObject(['moe', 'larry', 'curly'], [30, 40, 50]);
+    var shouldBe = {moe: 30, larry: 40, curly: 50};
+    ok(_.isEqual(result, shouldBe), 'two arrays zipped together into an object');
+  });
+
   test("arrays: indexOf", function() {
     var numbers = [1, 2, 3];
     numbers.indexOf = null;

underscore.js

@@ -426,10 +426,22 @@
     var args = slice.call(arguments);
     var length = _.max(_.pluck(args, 'length'));
     var results = new Array(length);
-    for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i);
+    for (var i = 0; i < length; i++) {
+      results[i] = _.pluck(args, "" + i);
+    }
     return results;
   };
 
+  // Zip together two arrays -- an array of keys and an array of values -- into
+  // a single object.
+  _.zipObject = function(keys, values) {
+    var result = {};
+    for (var i = 0, l = keys.length; i < l; i++) {
+      result[keys[i]] = values[i];
+    }
+    return result;
+  };
+
   // If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
   // we need this function. Return the position of the first occurrence of an
   // item in an array, or -1 if the item is not included in the array.