oop – Page 5 – Türker Yıldırım

An interface method removed, and the four implementations that kept it

NoteJanuary 4, 20241 min read

Removing a method from an interface leaves every implementation with a public method nothing calls, and the language has no opinion about that. The #[Override] attribute turns this…

Dynamic class constant fetch, and the lookup it replaces

NoteDecember 14, 20232 min read

Fetching a class constant by a variable name required constant() with a string concatenation, which no tool could follow. The syntax is better than the string concatenation mainly…

A model cast as an object, and the money type it holds

NoteDecember 13, 20232 min read

Two integer columns and a currency string, reassembled by hand in every place that needed a total. A cast that reads several columns and writes several is the…

#[Override] on a method that no longer overrides

NoteDecember 12, 20232 min read

Renaming a parent method is a silent break in every child, and 8.3 finally gives a way to say a method is meant to override something. Adding it…

A typed class constant, and the child that narrowed it

NoteDecember 8, 20232 min read

Constants were the last untyped declaration in the language, and 8.3 fixes that with the covariance rule you would expect. The type is checked at compile time on…

Typed class constants, and the interface that had been lying

Deep diveDecember 7, 202310 min read

8.3 on 23 November, and a constant can finally declare a type. An interface constant documented as a string, implemented as an int in one class.

readonly and clone, still awkward in 8.3

NoteDecember 6, 20232 min read

8.3 relaxed one readonly restriction and not the one everybody wants, so a wither is still a constructor call. The __clone relaxation is narrower than it first reads:…

The method that stopped overriding anything in 2019

Deep diveDecember 5, 202310 min read

#[Override] in 8.3, and what it asserts. A subclass method dead since a parent rename four years ago, with a bug report closed as not reproducible.

The interface with one implementation, and when that is fine

Deep diveNovember 16, 202310 min read

140 interfaces, 128 of them with exactly one implementation, and a jump-to-definition that always lands on the wrong file.

A specification object, and when the indirection pays

NoteSeptember 23, 20232 min read

A rule about which orders are eligible for a discount, expressed three times: in a query, in a validation check and in a report. The two methods must…