ijoshsmith

// This code assumes that ARC is enabled.

// Returns the size of this View in its NIB.
+ (CGSize)preferredSize
{
    static NSValue *sizeBox = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        // Assumption: The XIB file name matches this UIView subclass name.
        UINib *nib = [UINib nibWithNibName:NSStringFromClass(self) bundle:nil];

ijoshsmith

__weak id weakSelf = self;
void (^aBlock)(void) = ^{
    <MyClass> *strongSelf = weakSelf;
    if (strongSelf)
    {
        // strongSelf->someIvar = 42;
        // [strongSelf someMethod];
    }
};

ijoshsmith

import Foundation

extension Array
{
    /** Randomizes the order of an array's elements. */
    mutating func shuffle()
    {
        for _ in 0..<10
        {
            sort { (_,_) in arc4random() < arc4random() }

ijoshsmith

extension Array
{
    func crossJoin<E, R>(
        array:  [E],
        joiner: (t: T, e: E) -> R?)
        -> [R]
    {
        return arrayCrossJoin(self, array, joiner)
    }
}

ijoshsmith

/** 
Creates a dictionary with an optional 
entry for every element in an array.
*/
func toDictionary<E, K, V>(
    array:       [E],
    transformer: (element: E) -> (key: K, value: V)?)
    -> Dictionary<K, V>
{
    return array.reduce([:]) {

ijoshsmith

import UIKit

// The marshal operator is reviewed in this blog post…
// http://ijoshsmith.com/2014/07/05/custom-threading-operator-in-swift/

// Don't ever do something this ridiculous in a real app!
func printMarshalOperator()
{

                                          {p("M")}

ijoshsmith

//
// UPDATE: This gist was rendered obsolete as of
// Xcode 6 Beta 5, which introduced the nil 
// coalescing operator in Swift proper (??).
//

/* Nil-coalescing operator */
infix operator !! {}
func !! <T> (
    value: T?,

ijoshsmith

import Foundation

/** Outputs of the JSONObjectWithData function. */
enum JSONObjectWithDataResult
{
    case Success(AnyObject)
    case Failure(NSError)
}

/** 

ijoshsmith

// These methods assume that `self` references a UIViewController instance.

- (void)loadChildViewController:(UIViewController *)viewController
{
    [self addChildViewController:viewController];
    [self.view addSubview:viewController.view];
    [viewController didMoveToParentViewController:self];
}

- (void)unloadChildViewController:(UIViewController *)viewController

ijoshsmith

# Elixir (v1.0.3) solution to the FizzBuzz test, defined as:
#
# Write a program that prints the numbers from 1 to 100. But for multiples of three print 
# "Fizz" instead of the number and for the multiples of five print "Buzz". For numbers 
# which are multiples of both three and five print "FizzBuzz".
# Source: http://c2.com/cgi/wiki?FizzBuzzTest
#
# Inspired by programming exercises in the book 'Programming Elixir' by Dave Thomas.

defmodule FizzBuzz do