This article has been archived, as it was published several years ago, so some of its information might now be outdated. For more recent articles, please visit the main article feed.
Combining a sequence of functions
Here's how a sequence of operations can be chained together, by combining their functions into a single closure:
internal func +<A, B, C>(lhs: @escaping (A) throws -> B,
rhs: @escaping (B) throws -> C) -> (A) throws -> C {
return { try rhs(lhs($0)) }
}
public func run() throws {
try (determineTarget + build + analyze + output)()
}In functional languages, the above is often implemented as the pipe forward (|>) operator.
Swift by Sundell is brought to you by the Genius Scan SDK — Add a powerful document scanner to any mobile app, and turn scans into high-quality PDFs with one line of code. Try it today.