.

qwen/nodejs/node_modules/lodash/_hasPath.js

@@ -0,0 +1,39 @@
+var castPath = require('./_castPath'),
+    isArguments = require('./isArguments'),
+    isArray = require('./isArray'),
+    isIndex = require('./_isIndex'),
+    isLength = require('./isLength'),
+    toKey = require('./_toKey');
+
+/**
+ * Checks if `path` exists on `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path to check.
+ * @param {Function} hasFunc The function to check properties.
+ * @returns {boolean} Returns `true` if `path` exists, else `false`.
+ */
+function hasPath(object, path, hasFunc) {
+  path = castPath(path, object);
+
+  var index = -1,
+      length = path.length,
+      result = false;
+
+  while (++index < length) {
+    var key = toKey(path[index]);
+    if (!(result = object != null && hasFunc(object, key))) {
+      break;
+    }
+    object = object[key];
+  }
+  if (result || ++index != length) {
+    return result;
+  }
+  length = object == null ? 0 : object.length;
+  return !!length && isLength(length) && isIndex(key, length) &&
+    (isArray(object) || isArguments(object));
+}
+
+module.exports = hasPath;