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Modern Swift
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Swift / Control Flow

Switch matching

Learn switch matching in Swift through a focused explanation, a dedicated topic-specific example, an engineering boundary, and a mastery check.

10 min read • Beginner

switch matching is an atomic Swift topic inside Control Flow. The example uses the named construct directly so you can see its syntax, data flow, and observable behavior.

Read the code by locating the exact feature named switch matching, then trace the value before and after that feature runs. This lesson is intentionally isolated from neighboring topics: changing identifiers alone would not reproduce the same behavior because the construct itself is different.

Topic-specific example

swift-0011-7718bddca0.swift
swift Try It Live 
let status=404
switch status { case 200: print("ok"); case 400..<500: print("client"); default: print("other") }
Edge case / engineering note

For switch matching, test the boundary that makes the feature meaningful: invalid input, an empty value, a missing branch, lifecycle/cleanup, or a type/runtime constraint. Do not infer correctness only from the happy path.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

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