Making Swift Even More Functional

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Making Swift Even More Functional - Swift Summit

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Hello, I’m Veronica Ray!

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Swift is great, but it could be better Time to make change is now

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–The Recurse Center User’s Manual “Be rigorous. Understand how and why your code works. Understand your tools. If you're working with a framework (like Sinatra or Flask), learning to use it is just scratching the surface. Go deeper. Learn how it works.”

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– Functional Programming In Swift “Functional programmers emphasize that each program can be repeatedly broken into smaller and smaller pieces; all these pieces can be assembled using function application to deﬁne a complete program.”

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– Functional Programming In Swift “Functional programming… emphasizes the importance of programming with values, free of mutable state or other side effects.”

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CLASS VS STRUCT

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WHY FUNCTIONAL? •Helps you write clear and concise code •Makes concurrency easier •Reduces complexity

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SIMPLICITY

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COMPARED TO SCALA

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Too many custom operators and not opinionated enough

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FP IN SWIFT •list comprehensions •tail call optimization

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FP IN SWIFT •list comprehensions •tail call optimization

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LIST COMPREHENSIONS

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POWERFUL

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PYTHON

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PYTHON

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BYTE CODE

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PYTHON FOR LOOP

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BYTE CODE IS 23 LINES!

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BYTE CODE IS THE SAME

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SPELLING CORRECTOR

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CONCISENESS Reading code Writing code

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ADDING IT TO SWIFT

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FP IN SWIFT •list comprehensions •tail call optimization

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RECURSION

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TAIL CALL

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TAIL RECURSIVE CALL

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STACK TRACE (fact 3) (fact-tail 3 1) (fact-tail 2 3) (fact-tail 1 6) (fact-tail 0 6) 6

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NOT TAIL RECURSIVE

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STACK TRACE (fact 3) (* 3 (fact 2)) (* 3 (* 2 (fact 1))) (* 3 (* 2 (* 1 (fact 0)))) (* 3 (* 2 (* 1 1))) (* 3 (* 2 1))

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TAIL CALL OPTIMIZATION

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NOT GUANRANTEED

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SWIFT CODE

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BYTE CODE jne to the label containing the conditional jump

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BLOW OUT THE STACK

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HOPE?

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CHANGE YOUR BYTECODE CHANGE YOUR LIFE

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RECURSION KILLS

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RADAR

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LEARN MORE

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•Functional Swift Conference •Open Radar •Dev Forums •Twitter •Natasha The Robot’s Blog