= Command–query separation
{wiki=Command–query_separation}
Command-Query Separation (CQS) is a programming principle that states that a method should either be a command that performs an action or a query that returns data, but not both. This principle helps to maintain a clear distinction between actions that change the state of a system and those that retrieve information about the system's state. \#\#\# Key Aspects of CQS: 1. **Commands**: These are methods that perform operations that modify the state of an object or system.
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