gspiers

Falsehoods programmers believe about prices

1. You can store a price in a floating point variable.
2. All currencies are subdivided in 1/100th units (like US dollar/cents, euro/eurocents etc.).
3. All currencies are subdivided in decimal units (like dinar/fils)
4. All currencies currently in circulation are subdivided in decimal units. (to exclude shillings, pennies) (counter-example: MGA)
5. All currencies are subdivided. (counter-examples: KRW, COP, JPY... Or subdivisions can be deprecated.)
6. Prices can't have more precision than the smaller sub-unit of the currency. (e.g. gas prices)
7. For any currency you can have a price of 1. (ZWL)
8. Every country has its own currency. (EUR is the best example, but also Franc CFA, etc.)

gspiers

// The trick is to link the DeviceSupport folder from the beta to the stable version.
// sudo needed if you run the Mac App Store version. Always download the dmg instead... you'll thank me later :)

// Support iOS 14 devices (Xcode 12.0) with Xcode 11.5:
sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/14.0 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

// Then restart Xcode and reconnect your devices. You will need to do that for every beta of future iOS versions

gspiers

// UICollectionView Objective-C example

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
        
    NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] firstObject];
    if (selectedIndexPath != nil) {
        id<UIViewControllerTransitionCoordinator> coordinator = self.transitionCoordinator;
        if (coordinator != nil) {
            [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

gspiers

// Stringly typed 💩
// This throws an Obj-C exception and crashes if you get the name wrong. It would be better if it returned an optional.
let bootstrapRootStoryboard = UIStoryboard(name: "BootstrapRoot", bundle: Bundle.main)
guard let appKilledViewController = bootstrapRootStoryboard.instantiateViewController(withIdentifier: "appKilledViewController") as? AppKilledViewController else {
    fatalError("Unexpected viewcontroller for identifier 'appKilledViewController'")
}

// Strongly typed using SwiftGen 😀
let appKilledViewController = StoryboardScene.BootstrapRoot.instantiateAppKilledViewController()

gspiers

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

class MyError: Error {}

protocol P {
    func throwingFunc() throws -> Int
    func nonThrowingFunc() -> Int
}

gspiers

Keybase proof

I hereby claim:

• I am gspiers on github.
• I am gspiers (https://keybase.io/gspiers) on keybase.
• I have a public key whose fingerprint is 6BAB DBDF E67D 3449 FD78 2184 7F33 A838 EE52 6CA4

To claim this, I am signing this object: