## Array & Dictionary

ArrayDictionaryTest.playground

// Array & Dictionary: Playground – noun: a place where people can play
// 2015.09.20 Kyoung Shin Park @ Dankook University

import UIKit

var a = Array<String>()
var b = [String]()
var c = [Int](count: 3, repeatedValue: 1)

let animals = [“Giraffe”, “Cow”, “Dog”, “Cat”]
//animals.append(“Bird”) // due to let
var animal = animals[1]
//var animal2 = animals[5] // due to out of bounds
for animal in animals {
print(animal)
}
for (index, value) in animals.enumerate() {
print(“animals[\(index)]=\(value)”)
}

b.append(“Egg”)
b += [“Cocoa”, “Milk”, “Flour”]
b[1…3] = [“Apple”, “Butter”]
print(b)

c.insert(4, atIndex: 1)
c.insertContentsOf([5,6], at: 2)
c.removeAtIndex(1)
c.removeRange(0..<2)
c.replaceRange(0…1, with: [8,9,7])
let sorted = c.sort { \$0 < \$1 }
for value in sorted {
print(value)
}

// map, filter, reduce
var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
var arr1 = arr.map { (x)->Int in return x+1 }
print(arr1)
var arr2 = arr.map { (x)->Int in return x*2 }
print(arr2)
var arr3 = arr.filter { (x)->Bool in return x%2 == 0 }
print(arr3)
var sum = arr.reduce(0, combine: { (result, x)->Int in return result+x } )
print(sum)
let sum2: Int = arr.reduce(0) { \$0 + \$1 }
print(sum2)
let stringified = arr.map { “\(\$0)” }
print(stringified)

// dictionary
var planets1 = Dictionary<String, Int>() //empty dictionary
var planets = [String: Int]() // empty dictionary
planets = [ “Mercury”:1, “Venus”:2
] // assign
planets[“Mars”] = 3 // append
for (key, value) in planets {
print(“\(key) = \(value)”)
}
planets[“Mars”] = 4 // replace
for (key, value) in planets {
print(“\(key) = \(value)”)
}
let earth = planets[“Earth”] // earth is an Int? (should be nil)
if earth == nil {
} else {
let earthID = earth!
print(“Earth = \(earthID)”)
}
planets[“Earth”] = 3 // append Earth
// optional binding
if let earthID = planets[“Earth”] {
print(“Earth = \(earthID)”)
}

## String

StringTest.playground

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

import Cocoa

var letters: [Character] = [“c”, “a”, “f”, “e”]

var cafe = String(letters)

print(letters.count)

print(cafe)

print(cafe.characters.count)

let string1 = “”

var string2: NSString = “Hello”

switch (string2) {

case let string2 as NSString:

print(“string2 is NSString”)

case let string2 as String:

print(“string2 is String”)

default:

print(“None of those”)

}

var len = string2.length

var string3 = String(“Hello”)

string3 += ” World”

string3.append(Character(“!”))

var string4 = String(count: 7, repeatedValue: Character(“A”))

var string5 = NSString()

var string9 = NSString(string: “Hello”)

var string6 = NSMutableString(capacity: 10)

var total = 100

var string7 = “\(string3)! total=\(total)”

var string8: NSString = string7

//var string10: String = string3.stringByAppendingFormat(” append %@”, total)

//print(string10)

string5 = string2.stringByAppendingFormat(” append %@”, string8)

print(string8)

print(string8.description)

var str = “Hello”

var world = ” World”

var smile = “?”

var mark = “!~”

var combined = str + mark

var combined2 = (str + world).stringByAppendingString(smile)

var len2 = combined2.characters.count

// length

var length = combined.characters.count

var len3 = combined.startIndex.distanceTo(combined.endIndex)

var len4 = (combined as NSString).length

// print char of string

for char in combined.characters {

print(char)

}

print(combined2.lowercaseString)

print(combined2.uppercaseString)

print(combined2.capitalizedString)

if let range = combined.rangeOfString(“ello”) { // contains

print(“ello”)

}

else {

print(“none”)

}

var trail = combined.substringWithRange(Range<String.Index>(start: str.endIndex, end: combined.endIndex))

print(“combined = \(combined)”)

//combined.insert(“^”, atIndex: combined.endIndex)

//let question : Character = “?”

//combined.append(question)

//print(combined)

combined.insert(“a”, atIndex: startIndex)

combined.insertContentsOf(“bc”.characters, at: startIndex.successor())

combined.removeAtIndex(combined.endIndex.predecessor())

print(combined)

let substring = combined[startIndex..<endIndex]

print(“substring = \(substring)”)

var sub2 = combined.substringWithRange(Range<String.Index>(start: startIndex, end: endIndex))

print(sub2)

var myString = “Seoul, New York, Tokyo LA”

var myArray = myString.componentsSeparatedByString(“,”)

for s in myArray {

print(s)

}

var myArray2 = myString.componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: “, “))

for s in myArray2 {

print(s)

}

var num = “56.25”

if let range = num.rangeOfString(“.”) {

let wholeNum = num[num.startIndex..<range.startIndex]

print(“wholeNum=\(wholeNum)”)

num.replaceRange(num.startIndex..<range.startIndex, with: “32”)

print(“num=\(num)”)

num.removeRange(num.startIndex..<range.startIndex)

print(“num2=\(num)”)

}

let animals = [“Giraffe”, “Cow”, “Dog”, “Cat”]

//animals.append(“Bird”)

var animal = animals[2]

for (index, value) in animals.enumerate() {

print(“animals[\(index)]=\(value)”)

}

## HelloWorld

HelloWorld

-label & button & UIAlertController & autolayout

//

//  ViewController.swift

//  HelloWorld

//

//  Created by Park on 8/30/15.

//

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var label1: UILabel!

@IBAction func showMessage(sender: AnyObject) {

label1.text = “Welcome to Swift”

}

}

// Dispose of any resources that can be recreated.

}

}

https://developer.apple.com/xcode/

“Xcode 7 and Swift now make it easier for everyone to build apps and run them directly on their Apple devices. Simply sign in with your Apple ID, and turn your idea into an app that you can touch on your iPad, iPhone, or Apple Watch. Download Xcode 7 beta and try it yourself today. Program membership is not required.”

1. Update OS X 10.10.5 (Yosemite) via App Store