JSONDecoder.swift

//: Playground - noun: a place where people can play

import Cocoa

var str = "Hello, playground"

struct Example: Codable {
    let name: String
    let age: Int
}

let example = Example(name: "Jonh", age: 30)
let data = try JSONEncoder().encode(example)

var restored = try JSONDecoder().decode(Example.self, from: data)

extension JSONDecoder {
    func decode<T>(_ data: Data) throws -> T where T: Decodable {
        return try decode(T.self, from: data)
    }
}

/// Type of existed variable will be used
do { restored = try JSONDecoder().decode(data) }

/// Explicit variable will be used
do { let _ : Example = try JSONDecoder().decode(data) }

/// Explicit expression type will be used
do { let _ = try JSONDecoder().decode(data) as Example }