erica

let fname = "/tmp/scratch.txt"
let fptr = fopen(fname, "w")
if (fptr == nil) {
    let localErrno = errno
    println("Unable to open \(fname): \(strerror(localErrno))")
} else {
    let text = "Hello World\n"
    let bytesWritten = fwrite(text, UInt(sizeof(Byte)), strlen(text), fptr)
    println("Wrote \(bytesWritten) bytes")
    fclose(fptr)

erica

func ErrorString1(error : NSError?) -> String {
    if let theError = error as? NSError {
        if let description = theError.localizedDescription {
            return description
        }
    }
    return ""
}

func ErrorString2(error_ : NSError?) -> String {

erica

struct PrimeGenerator : Generator {
    typealias Element = Int

    private var myPrimes = [Int]() // store previous primes
    var current : Int = 2 // first prime is 2
    mutating func next() -> Int? {
        if myPrimes.count == 0 {myPrimes = [2]; return 2}
        NextNumber: while (current++ > 0) {
            for prime in myPrimes {
                // If a number has a prime factor it is not prime

erica

// This should have worked. It doesn't work.
// Out of range error because the String.Index is set with regard to the smallest string at match

//extension String {
//
//   func findIndexOf(substring : String) -> String.Index? {
//        if countElements(self) < countElements(substring) {return nil}
//        if countElements(substring) == 0 {return nil}
//        if self.hasPrefix(substring) {return self.startIndex}
//        if let recursionResults = dropFirst(self).findIndexOf(substring) {

erica

 extension Array {
    func takeWhile(processingClosure : Element->Bool) -> [Element] {
        if (self.count == 0) {return []}
        let car : Element = self.first!
        if processingClosure(car) {
            let cdr : [Element] = Array(self[self.startIndex.successor()..<self.endIndex])
            return [car] + cdr.takeWhile(processingClosure)
        } else {
            return []
        }

erica

Testing iPhone 6 plus
iPhone Simulator
iPhone OS
8.0
iPhone Simulator
<UIView: 0x7f854596f7a0; frame = (0 0; 414 736); autoresize = W+H; layer = <CALayer: 0x7f854596bd50>>
<UIWindow: 0x7f854596e1e0; frame = (0 0; 414 736); gestureRecognizers = <NSArray: 0x7f854596edd0>; layer = <UIWindowLayer: 0x7f854596c0d0>>

Testing iPhone 6
iPhone Simulator

erica

// Thanks, Lily Ballard
extension Optional {
    func and<U>(x:U?) -> (T, U)? {
        switch (self, x) {
        case let (.Some(first), .Some(second)):
            return (first, second)
        default:
            return nil
        }
    }

erica

import Foundation

func QLString(x : QuickLookObject) -> String {
    switch x {
    case .Text(let s) : return "[Text] " + s
    case .Int(let i) : return "[Int] " + "\(i)"
    case .UInt(let u) : return "[UInt] " + "\(u)"
    case .Float(let f) : return "[Float] " + "\(f)"
    case .Image(let img) : return "[Image] " + "[image]"
    case .Sound(let snd) : return "[Sound] " + "[sound]"

erica

//
//  TupleAssignment.swift
//  Hello Swift
//
//  Created by Erica Sadun on 12/19/14.
//  Copyright (c) 2014 Erica Sadun. All rights reserved.
//

import Foundation

erica

postfix operator ⟹ {}
postfix func ⟹ <T:_ObjectiveCBridgeable>(obj : T) -> AnyObject { return _bridgeToObjectiveC(obj)! }
var s = "23.692"
NSString(string:s).doubleValue
s⟹.doubleValue