Updated the Survey.

node_modules/undefsafe/lib/undefsafe.js

@@ -0,0 +1,125 @@
+'use strict';
+
+function undefsafe(obj, path, value, __res) {
+  // I'm not super keen on this private function, but it's because
+  // it'll also be use in the browser and I wont *one* function exposed
+  function split(path) {
+    var res = [];
+    var level = 0;
+    var key = '';
+
+    for (var i = 0; i < path.length; i++) {
+      var c = path.substr(i, 1);
+
+      if (level === 0 && (c === '.' || c === '[')) {
+        if (c === '[') {
+          level++;
+          i++;
+          c = path.substr(i, 1);
+        }
+
+        if (key) {
+          // the first value could be a string
+          res.push(key);
+        }
+        key = '';
+        continue;
+      }
+
+      if (c === ']') {
+        level--;
+        key = key.slice(0, -1);
+        continue;
+      }
+
+      key += c;
+    }
+
+    res.push(key);
+
+    return res;
+  }
+
+  // bail if there's nothing
+  if (obj === undefined || obj === null) {
+    return undefined;
+  }
+
+  var parts = split(path);
+  var key = null;
+  var type = typeof obj;
+  var root = obj;
+  var parent = obj;
+
+  var star =
+    parts.filter(function(_) {
+      return _ === '*';
+    }).length > 0;
+
+  // we're dealing with a primitive
+  if (type !== 'object' && type !== 'function') {
+    return obj;
+  } else if (path.trim() === '') {
+    return obj;
+  }
+
+  key = parts[0];
+  var i = 0;
+  for (; i < parts.length; i++) {
+    key = parts[i];
+    parent = obj;
+
+    if (key === '*') {
+      // loop through each property
+      var prop = '';
+      var res = __res || [];
+
+      for (prop in parent) {
+        var shallowObj = undefsafe(
+          obj[prop],
+          parts.slice(i + 1).join('.'),
+          value,
+          res
+        );
+        if (shallowObj && shallowObj !== res) {
+          if ((value && shallowObj === value) || value === undefined) {
+            if (value !== undefined) {
+              return shallowObj;
+            }
+
+            res.push(shallowObj);
+          }
+        }
+      }
+
+      if (res.length === 0) {
+        return undefined;
+      }
+
+      return res;
+    }
+
+    if (Object.getOwnPropertyNames(obj).indexOf(key) == -1) {
+      return undefined;
+    }
+
+    obj = obj[key];
+    if (obj === undefined || obj === null) {
+      break;
+    }
+  }
+
+  // if we have a null object, make sure it's the one the user was after,
+  // if it's not (i.e. parts has a length) then give undefined back.
+  if (obj === null && i !== parts.length - 1) {
+    obj = undefined;
+  } else if (!star && value) {
+    key = path.split('.').pop();
+    parent[key] = value;
+  }
+  return obj;
+}
+
+if (typeof module !== 'undefined') {
+  module.exports = undefsafe;
+}