This means that an array defined as Array conforms to Codable already. For example, Int, String, and Bool are Codable out of the box.Įven dictionaries and arrays are Codable by default as long as the objects that you store in them conform to Codable. If you only want to transform instances of your struct into Data, you can conform your object to Encodable, and if you want to do both you can conform to Codable.Ī lot of Swift's built-in types already conform to Codable by default. When you only want to convert JSON data into a struct, you can conform your object to Decodable. ![]() These two protocols are used to indicate whether a certain struct, enum, or class, can be encoded into JSON data, or materialized from JSON data. The Codable protocol in Swift is really a union of two protocols: Encodable and Decodable. After that, I'll show you how to define a struct that implements the Codable protocol, and I'll explain the basics of encoding and decoding JSON data. I'll start by explaining what Swift's Codable is. It's good to understand that the principles in this series can be applied to both JSON data, as well as. I will focus on showing you how to work with JSON and Codable in Swift. ![]() The post you're looking at is intended to provide an introduction into Swift's Codable protocol, and it's part of a series of posts on this topic. plist file into Swift structs, or to convert Swift structs into data for a. Out of the box, Codable can also be used to decode a. What's nice about Codable is that it was designed to not be limited to JSON. And Swift's Codable protocol was designed to provide a powerful and useful mechanism to convert JSON data into Swift structs. Well, JSON is arguably the most common data format that we use to exchange data on the web. In this post, I want to take a look at Swift's Codable protocol. But that's way beyond what I want to cover in this post. ![]() Objects in Javascript are very comparable to dictionaries in Swift, except they aren't strongly typed and they have a couple of extra features. Javascript doesn't have strong typing, so a JSON object in Javascript is really just a JavaScript Object. When you're working with Javascript, this JSON data can be easily decoded into a Javascript object.
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