Bump to v4.1.0.

_hasPath.js

@@ -0,0 +1,36 @@
+define(['./_baseToPath', './isArguments', './isArray', './_isIndex', './_isKey', './isLength', './isString', './last', './_parent'], function(baseToPath, isArguments, isArray, isIndex, isKey, isLength, isString, last, parent) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * 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) {
+    if (object == null) {
+      return false;
+    }
+    var result = hasFunc(object, path);
+    if (!result && !isKey(path)) {
+      path = baseToPath(path);
+      object = parent(object, path);
+      if (object != null) {
+        path = last(path);
+        result = hasFunc(object, path);
+      }
+    }
+    var length = object ? object.length : undefined;
+    return result || (
+      !!length && isLength(length) && isIndex(path, length) &&
+      (isArray(object) || isString(object) || isArguments(object))
+    );
+  }
+
+  return hasPath;
+});