Bump to v4.0.0.

internal/hasPath.js

@@ -0,0 +1,37 @@
+var baseToPath = require('./baseToPath'),
+    isArguments = require('../isArguments'),
+    isArray = require('../isArray'),
+    isIndex = require('./isIndex'),
+    isKey = require('./isKey'),
+    isLength = require('../isLength'),
+    isString = require('../isString'),
+    last = require('../last'),
+    parent = require('./parent');
+
+/**
+ * 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);
+    }
+  }
+  return result || (isLength(object && object.length) && isIndex(path, object.length) &&
+    (isArray(object) || isString(object) || isArguments(object)));
+}
+
+module.exports = hasPath;