PrintWithReturn.swift

// something simple with an op at the return line
func foo() -> Int {
    return 4 + 1
}

// something verbose to get a print() of the return value
func foos() -> Int {
    let value = 4 + 1
    print(value)
    return value
}

// something obvious
extension String : CustomStringConvertible {
    public var description : String {
        return self
    }
}

// something helpfull
extension CustomStringConvertible {
    func debugPrintAndReturn(source: String = #file, caller: String = #function, line: Int = #line) -> Self {
        print(source,caller,line,self)
        return self
    }
    func printAndReturn() -> Self {
        print(self)
        return self
    }
}

// something easy to add and remove
func fooz() -> Int {
    return (4 + 1).printAndReturn()
}