Any data structure that isn&#x27;t explicitly designed for concurrent access will not work when used concurrently.<p>Since a concurrent map (aka. Dictionary aka. Hashtable) is a lot more complex and slow than a non concurrent one, it&#x27;s very very unlikely that Go would ship with its standard map type being a concurrent one. It would be a huge waste.<p>More likely there is a separate concurrent map type. It&#x27;s exactly the same in other languages with mutable collections (Java, .NET, C++, ...).