ahcode0919

let dateString = "09 Aug 2016 17:53:51 -0700"
let dateFormatter = NSDateFormatter()

// Good resource for date time format syntax
//http://userguide.icu-project.org/formatparse/datetime
dateFormatter.dateFormat = "dd MMM yyyy HH:mm:ss ZZZ"

let date = dateFormatter.dateFromString(dateString) //NSDate = "Aug 09, 2016, 5:53 PM"

ahcode0919

//XCode Playground Friendly

/**
 Singleton Pattern - Ensures that only one instance of a object exists in the application context
 usefull for things that will have a global context across the app.
 Ex: An internet connection, Credentials, etc.
 
 * Can only be used for reference types.
 */

ahcode0919

//Playground friendly

import Foundation
/*
 The Builder Pattern helps in the creation of complex objects
 
 *Implemented with Protocols
 */

/* Before Builder Pattern is implemented */

ahcode0919

//Anagram - Two words that contain the same characters

let testWord = "abcde"
let testWord2 = "edcba"

func isAnagram(word word: String, isAnagramOf word2: String) -> Bool {
    guard
        let word1Dictionary = countChars(word),
        let word2Dictionary = countChars(word2) else {
            return false

ahcode0919

let word = "abcdefg"

//Using swift lib
String(word.characters.reverse()) //"gfedcba"

//Using char array and insert
func reverseString(wordToReverse: String) -> String {
    guard wordToReverse.characters.count > 1 else {
        return wordToReverse
    }

ahcode0919

//Factory Pattern (Creational)
//Allows logic of which type will be created to be handled by a method

protocol SimpleType {
    var simpleName: String { get }
}

struct Type1: SimpleType {
    var simpleName: String = "Type1"
}

ahcode0919

// Bridge pattern (Structural)
//
// Decouples an abstraction from its implementation, so that the two can vary independently.
// Accomplished by seperating two interacting features and then creating a bridge type to
// handle where they overlap
protocol Database {
    func closeConnection()
    func openConnection()
    func saveRecord(recordToSave: Record)
}

ahcode0919

//Custom Map functions
//Experimenting with making custom map functions
//Original Map implementation: https://github.com/apple/swift/blob/master/stdlib/public/core/Sequence.swift

extension Sequence {
    func mapToDictionary<T>(_ transform: (Iterator.Element) throws -> (String, T)) rethrows -> [String: T] {
        let initialCapacity = underestimatedCount
        var result = [String: T]()
        var iterator = self.makeIterator()
        

ahcode0919

//Zip function (Sequence)
// https://github.com/apple/swift/blob/master/stdlib/public/core/Zip.swift
// https://developer.apple.com/reference/swift/1541125-zip
// http://swiftdoc.org/v3.0/func/zip/

let array1 = ["one", "two", "three", "four", "five"]
let array2 = 1...5

let zipSequence = zip(array1, array2)
type(of: zipSequence)   //Zip2Sequence<Array<String>, CountableClosedRange<Int>>.Type

ahcode0919

//Creating an operator
//prefix, postfix, infix
//https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Declarations.html
//https://developer.apple.com/reference/swift/swift_standard_library_operators

postfix operator ***

///Cubes value
postfix func *** (_ input: Int) -> Int {
    return input * input * input