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10 lessons we can learn from the 36,303 (and counting) Swift commits (And it's not a clickbait)

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1. Everything has a beginning

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Makefile lib/Lex/Lexer.cpp lib/Lex/Makefile lib/Makefile lib/Parse/Makefile lib/Parse/Parser.cpp tools/Makefile tools/swift/Makefile tools/swift/swift.cpp

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swift.cpp int main() { }

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11 commits later

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386 commits later

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2/A. SVN is not dead yet (At least not to everybody)

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2/B. If you struggle with git you're not alone

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3. 36% of Swift is written in Swift

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4. ♥ is in the stdlib

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Some examples... → Optionals → Array → Dictionary

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...Other examples → String → Int → Bool → Bit

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5. I tawt I taw a python

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6. Generate Your Boilerplate

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Template %{ integerBinaryOps = [ (x[:-1], x[-1], x[:-1].capitalize(), 'a result') for x in 'add+ subtract- multiply* divide/'.split() ] + [ ('remainder', '%', 'Divide', 'the remainder') ] }% Usage public protocol _IntegerArithmeticType { % for name,_,Action,result in integerBinaryOps: /// ${Action} `lhs` and `rhs`, returning ${result} and a `Bool` that is /// true iff the operation caused an arithmetic overflow. static func ${name}WithOverflow(lhs: Self, _ rhs: Self) -> (Self, overflow: Bool) % end }

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7. Comment your complexity

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/// Insert `newElement` at index `i`. /// /// Invalidates all indices with respect to `self`. /// /// - Complexity: O(`self.count`). public mutating func insert(newElement: Character, atIndex i: Index) { withMutableCharacters { (inout v: CharacterView) in v.insert(newElement, atIndex: i) } }

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8. We are the facilitators of our own creative evolution

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github.com/apple/swift-evolution

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Commonly rejected changes github.com/apple/swift-evolution/blob/master/ commonly_proposed.md

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March, 21st 2016 Swift 2.2 Integrates the community feedback

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9. We all code by night

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10. It's (too) easy to complain about someone else's code

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Thanks!

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Simone Civetta @viteinfinite

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Sources → Swift Weekly Brief by Jesse Squires → Swift Evolution Mailing List → github.com/apple