untested get and set

index.js

@@ -4,6 +4,29 @@ function Traverse (obj) {
     this.value = obj;
 }
 
+Traverse.prototype.get = function (ps) {
+    var node = this.value;
+    for (var i = 0; i < ps.length; i ++) {
+        if (!Object.hasOwnProperty.call(node, key)) {
+            node = undefined;
+            break;
+        }
+        node = node[ps[i]];
+    }
+    return node;
+};
+
+Traverse.prototype.set = function (ps, value) {
+    var node = this.value;
+    for (var i = 0; i < ps.length - 1; i ++) {
+        var key = ps[i];
+        if (!Object.hasOwnProperty.call(node, key)) node[key] = {};
+        node = node[key];
+    }
+    node[ps[i]] = value;
+    return value;
+};
+
 Traverse.prototype.map = function (cb) {
     return walk(this.value, cb, true);
 };