design-patterns – Page 6 – Türker Yıldırım

A repository interface, one implementation, one fake

NoteSeptember 21, 20232 min read

The argument that an interface with one implementation is waste ignores that the test double is a second implementation, and the argument that the double justifies it ignores…

A value object library, and the day it needed a serializer

Deep diveSeptember 20, 202310 min read

A Money type, an Email type, and thirty more, none of which can cross a boundary without being unwrapped by hand.

An outbox, and the publisher we removed from the transaction

Deep diveSeptember 20, 202310 min read

An order committed and an event never published, twice in one week. A broker call inside a database transaction, and a rollback after it.

An enum with an interface, and the match I stopped writing

NoteSeptember 18, 20232 min read

The same match on an enum, in four places, each returning a different aspect of the same thing. Moving the match onto the enum means adding a case…

A discriminated union instead of four optional fields

NoteSeptember 6, 20232 min read

A response type with four optional properties permits sixteen shapes, of which three are valid. The compiler now narrows on status, so the branch that reads data is…

A block variation instead of a second block

NoteAugust 30, 20231 min read

A “featured” version of an existing block, which had been built as a separate block with a duplicated edit component. A variation is the same block with different…

A trait with a constant, and why I still avoid traits

NoteAugust 24, 20232 min read

Constants in traits arrived in 8.2 and the first thing I did with the feature was decide not to use it. The method conflict rules have an escape…

Container queries, and the sidebar that stopped needing a class

NoteAugust 14, 20231 min read

A card that needed a –compact modifier wherever it appeared in a narrow column, applied by hand at every call site. The component now responds to the space…

An event log that is not an event store

Deep diveAugust 10, 202310 min read

Wanting to know what happened to an order without adopting event sourcing. A support question that takes twenty minutes and three tables.

Container queries, and the component that stopped needing a prop

Deep diveJuly 7, 202310 min read

A card with a variant prop that exists only to describe its width, rendered wrong in a sidebar somebody added last week.