Month: October 2018

CQS & CQRS

CQS means “Command-query separation”. It was introduced by Bertrand Meyer as part of his work on the Eiffel programming language. A method is either a command performing an action, or a query that returns data, but not both. Being purely action-performing methods, commands always have a void return type. Queries, on the other hand, should not have any observable side… Read more →