Bump to v4.0.0.

internal/baseUnset.js

@@ -0,0 +1,22 @@
+var baseToPath = require('./baseToPath'),
+    has = require('../has'),
+    isKey = require('./isKey'),
+    last = require('../last'),
+    parent = require('./parent');
+
+/**
+ * The base implementation of `_.unset`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to unset.
+ * @returns {boolean} Returns `true` if the property is deleted, else `false`.
+ */
+function baseUnset(object, path) {
+  path = isKey(path, object) ? [path + ''] : baseToPath(path);
+  object = parent(object, path);
+  var key = last(path);
+  return (object != null && has(object, key)) ? delete object[key] : true;
+}
+
+module.exports = baseUnset;