Test Doubles Explained: Mock, Stub, Spy, and Fake (Examples & Table)
There’s a wall every developer eventually hits when writing test code.
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Follow the trail from foundational concepts to practical engineering decisions.
Swift Visitor Pattern: When Double Dispatch Is Needed
In iOS development, you eventually need to keep adding operations to objects of many kinds, such as shapes or nodes.
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Swift Template Method Pattern: Building the Skeleton with a Protocol Extension
Have you ever copied similar logic across classes and thought, “This feels wrong”? By the third copy of screen-specific data-loading code in an iOS app, your hands start to hesitate.
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Swift String Length: Measure Hangul, Emoji, and Bytes
Compare Character, Unicode scalar, UTF-16, and UTF-8 counts; verify equivalent Hangul keys and slice a family emoji without splitting it.
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Swift Memento Pattern: A Complete Guide (Undo Implementation Example)
Have you ever hit a wall while adding an “Undo” button to an iOS app?
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