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Modern Swift
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Swift / Control Flow

Range matching

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

10 min read • Beginner

range 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 range 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-0012-7c706cd093.swift
swift Try It Live 
let age=17
switch age { case 0...12: print("child"); case 13...19: print("teen"); default: print("adult") }
Edge case / engineering note

For range 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

Lesson quizzes

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