diff --git a/lib/hash.js b/lib/hash.js
index 0a054b3..73be18d 100644
--- a/lib/hash.js
+++ b/lib/hash.js
@@ -1,7 +1,18 @@
 module.exports = Hash;
 var Traverse = require('traverse');
 
-function Hash (hash, extra) {
+function Hash (hash, xs) {
+    if (Array.isArray(hash) && Array.isArray(xs)) {
+        var to = Math.min(hash.length, xs.length);
+        var acc = {};
+        for (var i = 0; i < to; i++) {
+            acc[hash[i]] = xs[i];
+        }
+        return Hash(acc);
+    }
+    
+    if (hash === undefined) return Hash({});
+    
     var self = {
         map : function (f) {
             var acc = { __proto__ : hash.__proto__ };
@@ -139,3 +150,6 @@ Hash.concat = function (xs) {
     return hash.items;
 };
 
+Hash.zip = function (xs, ys) {
+    return Hash(xs, ys).items;
+};