new hash lib and clone sugar

lib/hash.js

@@ -0,0 +1,53 @@
+module.exports = Hash;
+var Traverse = require('traverse');
+
+function Hash (ref) {
+    var hash = Traverse.clone(ref);
+    return {
+        map : function (f) {
+            var acc = { __proto__ : hash.__proto__ };
+            Object.keys(hash).forEach(function (key) {
+                acc[key] = f.call(hash, hash[key], key);
+            });
+            return Hash(acc);
+        },
+        forEach : function (f) {
+            var acc = { __proto__ : hash.__proto__ };
+            Object.keys(hash).forEach(function (key) {
+                f.call(hash, hash[key], key);
+            });
+            return Hash(hash);
+        },
+        filter : function (f) {
+            var acc = { __proto__ : hash.__proto__ };
+            Object.keys(hash).forEach(function (key) {
+                if (f.call(hash, hash[key], key)) {
+                    acc[key] = hash[key];
+                }
+            });
+            return Hash(acc);
+        },
+        reduce : function (f, acc) {
+            var keys = Object.keys(hash);
+            if (acc === undefined) acc = keys.shift();
+            keys.forEach(function (key) {
+                acc = f.call(hash, acc, hash[key], key);
+            });
+            return acc;
+        },
+        end : hash,
+    };
+};
+
+Hash.map = function (ref, f) {
+    return Hash(ref).map(f).end;
+};
+
+Hash.filter = function (ref, f) {
+    return Hash(ref).filter(f).end;
+};
+
+Hash.reduce = function (ref, f, acc) {
+    return Hash(ref).reduce(f, acc);
+};
+

lib/traverse.js

@@ -95,3 +95,8 @@ function Traverse (refObj) {
         return acc;
     };
 }
+
+Traverse.clone = function (obj) {
+    return Traverse(obj).get();
+};
+