hachinobu

var evens = [Int]()
for i in 1...10 {
if i % 2 == 0 {
evens.append(i)
}
}
var evenSum = 0
for i in evens {

hachinobu

let a: String?
let b: String!
let c: String

a = nil //OK
b = nil //OK
c = nil //NG

hachinobu

navigationController?.toolbarHidden = false
// let hiddenはnil判定かつOptionalの開示された変数なのでwhereがないと条件が真になってしまう
if  let hidden = navigationController?.toolbarHidden where isbar {
	println(hidden)
}
else {
	println(hidden)
}

hachinobu

import Foundation

public func removeObject<T : Equatable>(object: T, inout fromArray array: [T])
{
  var index = find(array, object)
  array.removeAtIndex(index!)
}

hachinobu

http://www.raywenderlich.com/90695/modern-core-graphics-with-swift-part-3

hachinobu

func flatMap<A, B>(x: A?, f: A -> B?) -> B? {
    if let x = x {
        return f(x)
    } else {
        return nil
    }
}

hachinobu

func map<T, U>(xs: [T], f: T -> U) -> [U] {
    var result: [U] = []
    for x in xs {
        result.append(f(x))
    }
    return result
}

hachinobu

struct TableSectionRowInfo {
    
    enum RowInfo {
        case SecOne1
        case SecOne2
        case SecTwo1
        case SecTwo2
        case SecTwo3
        
        func rowCount() -> Int {

hachinobu

let someOptional:Int? = 42
if case .Some(let x) = someOptional{
  print("someOptional value is \(x)")
}

if case let x? = someOptional{
  print("someOptional value is \(x)")
}

let arrayOptionalInts:[Int?] = [nil,1,2,3,nil,5]

hachinobu

import UIKit

public protocol Groupable {
    func sameGroupAs(other: Self) -> Bool
}

extension CollectionType {
    
    public typealias ItemType = Self.Generator.Element
    public typealias Grouper = (ItemType, ItemType) -> Bool