ARTICLE Function Composing Swift 2.0 - 3

article-function-composing-4.swift

func combine <A,B,C>(first: A throws -> B, _ second: B throws -> C) -> (A throws -> C) {
    return { (parameter: A) throws -> C in
        let finalResult = try second(first(parameter))
        return finalResult
    }
}

let data = //... the NSData representing the json

let parseAndValidate = combine(parseJSONFromNSData, validateJSONResponse)