Swift: Tuples and Functions

SwiftCrunch, Krakow, Nov 16, 2014

Transcript

1. Swi$ Tuples'and'Func-ons Antonio&Bello Freelancer Code%Ar(st,%Polyglot%Developer @ant_bello
2. What's'a'tuple? A"tuple"it's"an"anonymous"struct • it$can$contain$mul,ple$heterogeneous$values • values$can$be$named$or$anonymous
3. Return'mul*ple'values func quotientAndRemainder(# dividend: Int, # divisor: Int) -> (quotient: Int, remainder: Int) { let quotient = dividend / divisor return (quotient: quotient, remainder: dividend - divisor * quotient) } let result = quotientAndRemainder( dividend: 59, divisor: 13)
4. Pass$parameters$to$func/ons$and$ methods func quotientAndRemainder(# dividend: Int, # divisor: Int) -> (quotient: Int, remainder: Int) { let quotient = dividend / divisor return (quotient: quotient, remainder: dividend - divisor * quotient) } let params = (dividend: 61, divisor: 7) let result = quotientAndRemainder(params)
5. Func%on'arguments'and'return' values'are'tuples A"func'on"with"no"parameters"takes"an"empty"tuple" ():" func doNothing() {...}
6. Func%on'arguments'and'return' values'are'tuples A"func'on"returning"Void"actually"returns"an"empty" tuple"(): func doSomething() -> () {...}
7. Func%on'arguments'and'return' values'are'tuples A"func'on"expec'ng"one"parameter"and"returning"a" single"value"actually: • takes'a'tuple'with'one'value • returns'a'tuple'with'one'value func doSomething(value: Int) -> (Int) { ... }
8. Use$Cases
9. Use$cases Collec&ng)parameters)before) func&on)call Without'tuples ... var dividend = 29 ... var divisor = 3 ... let result = quotientAndRemainder( dividend: dividend, divisor: divisor)
10. Use$cases Collec&ng)parameters)before) func&on)call With%tuples var params: (dividend: Int, divisor: Int) ... params.dividend = 29 ... params.divisor = 3 ... let immutableParams = params let result = quotientAndRemainder(immutable)
11. Important! A"tuple"passed"to"a"func/on"must"be"immutable let immutableParams = params let result = quotientAndRemainder(immutableParams)
12. Use$cases Buffering)func,on)calls Some%Code...
13. Thank&You code%@%github/jeden Antonio&Bello @ant_bello