For medium article - SOLID Swift Using Protocols !!!

SRPFail.swift

struct DataManager {
	
	func manage() {
		let data = loadData()
		let array = parseData(data)
		saveData(array)
	}

	func loadData() -> Data {
		// load data from some URL
	}

	func parseData(_: Data) -> [String] {
		// parse json data to array of strings
	}

	func saveData(_: [String]) {
		// save the data to DB
	}
}