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Sarunw0 Hot0 comments4 min read
Trailing commas beyond arrays in Swift 6.1
Swift 6.1 extends trailing comma support beyond array literals to nearly every comma-separated list where a closing bracket follows — function parameters and arguments, tuples, enum associated values, generic parameter lists, closure capture lists, subscripts, attribute and macro arguments, and string interpolations. The rule is simple: a trailing comma is allowed whenever a closing bracket comes right after it. It doesn't work in condition lists, inheritance clauses, where clauses, or case labels, since nothing closes those lists, making a trailing comma ambiguous. The feature reduces noisy diffs and removes a persistent tax on macro-based code generators that build argument lists programmatically.
Source: https://sarunw.com/posts/trailing-comma-in-swift. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.
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