command–query separation (Q3954590)

principle that every method should either be a command that performs an action, or a query that returns data to the caller, but not both; asking a question should not change the answer

Language	Label	Description	Also known as
English	command–query separation	principle that every method should either be a command that performs an action, or a query that returns data to the caller, but not both; asking a question should not change the answer