takasek

/// CodingKeyのマッピングを動的に切り替える
protocol CodingKeyMapper {
    static var mapper: [String: S<Self>.CodingKeys] { get }
}
extension CodingKeyMapper {
    static var mapper: [String: S<Self>.CodingKeys] { return [:] }

    static func key(_ stringValue: String) -> S<Self>.CodingKeys? {
        return mapper[stringValue]
    }

takasek

//
//  HashablePerformanceTests.swift
//  HashableExampleTests
//
//  Created by takasek on 2017/06/18.
//  Copyright © 2017年 takasek. All rights reserved.
//

import XCTest

takasek

import Foundation

//===----------------------------------------------------------------------===//
// CSV Decoder
//===----------------------------------------------------------------------===//

/// `CSVDecoder` facilitates the decoding of CSV into semantic `Decodable` types.
/// structでなくclassなのは、JSONDecoderやPlistDecoderの場合にはoptionを適宜切り替えつつdecodeしていけるようにだと思う
/// 実際の Decoder プロトコルへの適合は、fileprivateな _CSVRowDecoder 型を通して行う。
open class CSVDecoder {

takasek

import Foundation

struct S1: Codable {
    let dateFromTimeInterval: Date
}

struct S2: Codable {
    let dateFromISO8601: Date
}

takasek

import Foundation

struct User: Codable {
    struct Address: Codable {
        let street: String
        let city: String
        let state: String
    }
    let name: String
    let address: Address

takasek

import Foundation

struct User: Codable {
    struct Address: Codable {
        let street: String
        let city: String
        let state: String

        private enum AddressCodingKeys: CodingKey {
            case street

takasek

struct Hoge: Equatable, Hashable {
    let a: Int
    let b: Int
    static func == (lhs: Hoge, rhs: Hoge) -> Bool {
        return lhs.a == rhs.a
            && lhs.b == rhs.b
    }
    var hashValue: Int {
        return a
    }

takasek

class Propotion {}
final class 🐕: Propotion {}
final class 🐶: Propotion {}

// 👆class継承使ってるけど、
// Swift3.1.1以降は👇でもよさそう？
//protocol Propotion {}
//struct 🐕: Propotion {}
//struct 🐶: Propotion {}

takasek

let num = 1 as NSNumber

num === num
//true

(num as Int as NSNumber) === (num as Int as NSNumber)
//false

(num as UInt as NSNumber) === (num as UInt as NSNumber)
//false

takasek

import Foundation

do {
    let value = 1
    let a = value as AnyObject
    let b = value as AnyObject

    a === b //false
    //値型は、as AnyObjectのタイミングでclassインスタンスにboxingされる
    //as AnyObjectのタイミングが異なれば、別のclassインスタンスとしてboxingされる