Скачать с ютуб Migrating Kotlin Context Receivers в хорошем качестве

Migrating Kotlin Context Receivers

Last week’s refactoring (   • Abolishing Kotlin Context Receivers  ) to remove our IO context receiver was relatively easy because the receiver was never actually referenced, it was just a marker. Our transaction context receiver may carry state though, so to remove its use we are going to have to convert from function contexts to function parameters. This is the widest-ranging refactor that we have yet covered, and is hampered by IntelliJ’s tooling not properly supporting context receivers, but as you will see we still never had more than five minutes where the code didn’t compile and pass all the tests. This is crucial, as it means that we can make changes like this on the main branch, integrating regularly so that we won’t need a complex and risky merge when the whole task is complete. In this episode 00:00:47 Review transaction context receivers 00:02:25 A context receiver is, in essence, just another parameter 00:03:05 Context parameter variance always was broken 00:04:02 Chase through the change in variance 00:06:40 Convert a constructor to a companion invoke to fix generics 00:07:20 Generics taint lots of code 00:10:15 Swapping function calls with expand / contract 00:11:46 We need to do the same for all Items subtypes 00:13:57 Commit before making a hard-to-reverse changes 00:14:23 00:14:39 Migrate clients to the new function by inlining the old one 00:15:04 which doesn't work 00:15:16 Write a non-context inTransaction to simplify the fixes 00:18:57 Getting tedious now 00:19:38 Failing tests points us to another structural problem 00:20:46 Commit once we are running to bank the progress 00:21:04 Speedrun the save operation 00:23:11 Finally Items has lost its context receivers 00:23:45 Remove our last context receivers from Stock 00:27:06 Review and commit There is a playlist of TDD Gilded Rose episodes -    • Test Driven Gilded Rose in Kotlin   The codebase is available on GitHub https://github.com/dmcg/gilded-rose-tdd I get lots of questions about the test progress bar. It was written by the inimitable @dmitrykandalov. To use it install his Liveplugin (https://plugins.jetbrains.com/plugin/...) and then this gist https://gist.github.com/dmcg/1f56ac39... Thanks to Orion Williams for the music https://toolofgod.com/my-music/royalt... If you like this video, you’ll probably like my book Java to Kotlin, A Refactoring Guidebook (http://java-to-kotlin.dev). It's about far more than just the syntax differences between the languages - it shows how to upgrade your thinking to a more functional style.