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Shotgun Surgery is a smell where one change is scattered across multiple files, while Divergent Change is its mirror image: one file changes for multiple reasons. This article explains how to measure and distinguish these opposite smells using commit history.
Read articleA God Object is a class that keeps absorbing surrounding responsibilities and data as it grows, becoming the file that changes and conflicts most often on a team. This guide covers the signals of growth, the extraction order, and two ways splitting it can fail.
Read articleApp sizes shrank after Swift 5 and iOS 12.2 shipped in 2019, thanks to ABI stability. This article covers how the Swift runtime moved from every app into the OS, along with module stability and the trade-offs of @frozen.
Read articleEvery function is five lines long and has one responsibility, yet nobody can explain what happens when a button is pressed. This article covers why decomposition goes too far, the cost revealed by jump counts, and how to recover the flow.
Read articleSynchronous vs. asynchronous concerns who tracks task completion, while blocking vs. non-blocking concerns whether control is returned immediately. This guide explains why the two independent axes produce all four 2×2 combinations, with Swift examples.
Read articleResources such as file handles and locks are meaningful only when unique, so they must not be copied. This guide explains how Swift 5.9’s ~Copyable encodes noncopyability in a type, covers borrowing, consuming, and inout, and clarifies where to use them.
Read articleSwift 5.9 macros are code-generation plugins embedded in the compiler. This overview covers how they receive syntax trees and return code, the freestanding (#) and attached (@) branches, and the cost of creating your own.
Read articleA struct's size is not a simple sum of its properties. This covers measured size, stride, alignment, padding, Optional's use of extra inhabitants, and 64-bit existential containers.
Read articleLasagna code is code where adding one field requires changing seven files despite neatly separated layers. This article summarizes why layers multiply, where they cost you, and when to keep or remove them.
Read articleClaude Code permissions use allow, ask, and deny rules, evaluated with deny first. This article covers /permissions, Bash wildcard syntax, Shift+Tab mode cycling, and settings-file precedence.
Read articleMethod calls compile as direct calls, vtable lookups, or objc_msgSend. This article explains why final and private improve performance, the trap in protocol extensions, and how to verify it with a profiler.
Read articleThe moment you attach an observer, KVO dynamically swaps the object's class with a subclass. This covers isa-swizzling, why class lies, and when notifications are not sent without going through the setter.
Read articleClaude Code plan mode requires approval of a plan before changing code. This covers enabling it with Shift+Tab or /plan, the three approval options, editing plans with Ctrl+G, and setting defaults.
Read articleTest Plans manage the tests to run and their execution conditions in .xctestplan files. This guide covers why schemes alone are insufficient, test selection, configurations, coverage, execution order, repetition, and xcodebuild integration.
Read articleStructured concurrency answers who is responsible for ending asynchronous work. This article covers why child tasks cannot escape their parent scope, how cancellation propagates, and which guarantees you must manually reclaim with Task.detached.
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