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October 25, 2022 07:28
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| import Foundation | |
| /// | |
| /// Pipe operator | |
| /// | |
| precedencegroup ForwardApplication { | |
| associativity: left | |
| higherThan: AssignmentPrecedence | |
| } | |
| infix operator |> : ForwardApplication | |
| infix operator ?|> : ForwardApplication | |
| public func |> <T, U>(x: T, f: (T) -> U) -> U { | |
| return f(x) | |
| } | |
| public func ?|> <T, U>(x: T?, f: (T) -> U) -> U? { | |
| guard let x = x else { return nil } | |
| return f(x) | |
| } | |
| public func |> <T, U>(x: T, keyPath: KeyPath<T, U>) -> U { | |
| return x[keyPath: keyPath] | |
| } | |
| /// | |
| /// Trivial examples | |
| /// | |
| func addOne(a: Int) -> Int { | |
| a + 1 | |
| } | |
| func timesTwo(a: Int) -> Int { | |
| a * 2 | |
| } | |
| let number = 5 |> addOne(a:) |> timesTwo(a:) | |
| let capitalized = "hello" |> URL.init(string:) | |
| /// | |
| /// Curry and inspect | |
| /// | |
| func reverseCurry<A, B, C>(_ f: @escaping (A, B) -> C) -> (B) -> (A) -> C { | |
| { (b: B) in | |
| { (a: A) in | |
| return f(a, b) | |
| } | |
| } | |
| } | |
| func inspect<T>(x: T) -> T { | |
| print(x) | |
| return x | |
| } | |
| /// | |
| /// More interesting example | |
| /// | |
| let initString = reverseCurry(String.init(data:encoding:)) | |
| Data([72, 101,108, 108, 111]) | |
| |> initString(.utf8) | |
| |> inspect | |
| ?|> \.count | |
| ?|> inspect |
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