If your question was closed as a duplicate of this, it is because you have some code of the general form x = X() # later... x = x.y() # or: x.y().z() where X is some type that provides y and z met...

I started writing a fluent interface and took a look at an older piece Martin Fowler wrote on fluent interfaces (which I didn't realize he and Eric Evans coined the term). In the piece, Martin ment...

In wikipedia's definition of command query separation, it is stated that More formally, methods should return a value only if they are referentially transparent and hence possess no side effe...

I am learning what is CQRS pattern and came to know there is also CQS pattern. When I tried to search I found lots of diagrams and info on CQRS but didn't found much about CQS. Key point in CQRS ...

I implement Event Sourcing and CQRS pattern in my application. I inspired by CQRS journey where I downloaded sample code. There I found whole infrastructure for Event sourcing (CommandHandlers, Eve...

Given a real-world anonymous shopping cart, the "AddToCart" workflow must do the following steps: Lookup the current product from the database. Get the price from the product or use a service to ...

The CQS-principle (https://en.wikipedia.org/wiki/Command%E2%80%93query_separation) states that a command should return void. The recommendation for async methods is to never return void (https://...

I like the idea of Command Query Separation but can't see how to use it within an MVC Controller action which is adding an entity, and needs the new entity's ID after adding it. For example, in the...

What would be the naming conventions in Python for functions that can return a modified object or that just modifies the instance. Let's assume you want to implement both, how you should name the ...

Edit: fixed several syntax and consistency issues to make the code a little more apparent and close to what I actually am doing. I've got some code that looks like this: SomeClass someClass; var ...