flow like the river

BACK_BACK/node_modules/mongoose/lib/helpers/path/parentPaths.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const dotRE = /\./g;
+module.exports = function parentPaths(path) {
+  if (path.indexOf('.') === -1) {
+    return [path];
+  }
+  const pieces = path.split(dotRE);
+  const len = pieces.length;
+  const ret = new Array(len);
+  let cur = '';
+  for (let i = 0; i < len; ++i) {
+    cur += (cur.length !== 0) ? '.' + pieces[i] : pieces[i];
+    ret[i] = cur;
+  }
+
+  return ret;
+};