Add documentation for parameter packs #174
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Confirmed the code examples here and in SE-0399 work as of Swift 5.9 (swiftlang-5.9.0.120.7)
Co-authored-by: Holly Borla <hborla@apple.com>
| the `repeat` operator must appear first. | ||
| (So `repeat try each foo` or `repeat each try foo`) | ||
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| - All of the `each` expressions in a parameter-pack expression |
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I'm having a similar reaction to the hyphen in parameter-pack here, but am starting to wonder whether this is just my lack of familiarity with our formal documentation and this is some convention in certain circumstances? Because I am not seeing the hyphen used in parameter-pack elsewhere in this PR.
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In these cases 'parameter pack' is being used as a compound adjective, so it should be hyphenated. My favorite case is something like 'drag and drop' vs. 'drag-and-drop operation': https://support.apple.com/guide/applestyleguide/d-apsg7af4f5d0/1.0/web/1.0#:~:text=drag-and-drop
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I think what's strange here is the overall term "parameter-pack expression". We should call it the "pattern expression".
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(No opinion here either way, but there might be confusion with this other meaning of pattern: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/patterns , although 'pattern expression' isn't used in that context. Edit: That chapter does have 'expression pattern'.)
| the whole line is duplicated once for each type. | ||
| When you use `repeat` in the middle of a line (as an expression), | ||
| it expands to make a tuple | ||
| with one tuple element for each type. |
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Hmm... only if you have done so within tuple parentheses?
Cherry-picked from swiftlang#206
Removed stray whitespace at end of lines. Restored line breaks for unchanged content. Split lines in new content at clause and sentence boundaries, instead of wrapping at 80 columns.
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Fixes: rdar://102835487