frankus

struct MyStruct: Decodable {
  let data: Data
  
  static func decodeHexData(_ decoder: Decoder) throws -> Data {
    let container = try decoder.singleValueContainer()
    let stringValue = try container.decode(String.self)

    guard let data = Data(hexString: stringValue) else {
      throw MyStructError.invalidHexString(stringValue)
    }

frankus

find . -iname '*.[mh]' -print0 | while IFS= read -r -d '' file; do basename=`basename "$file"`; sed -i .bak "2s|//  .*\$|//  $basename|" "$file"; done

frankus

cares
saree
sores
seres
bares
soree
soras
cores
sires
sared

frankus

For testability purposes (and to make things easier to reason about), sometimes it's nice if methods in a class are pure functions, that is, they don't contain any explicit or implicit references to self, or really anything other than the arguments that are passed in.

In the painfully contrived example below, method is a method (because it references both a property and another method using self) and isEven is a pure function (because it doesn't).

class MyClass {
  let number: Int
  
 init(number: Int) {

frankus

//
//  UIImageView+MapSnapshot.h
//  Awning
//
//  Created by Frank Schmitt on 3/31/14.
//

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

frankus

@interface UIBarButtonItem (FlexibleSpace)

+ (instancetype)barButtonItemFlexibleSpace;

@end

@implementation UIBarButtonItem (FlexibleSpace)

+ (instancetype)barButtonItemFlexibleSpace {
    return [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

frankus

find . -iname "*.[mh]" -exec sed -n "2s|^//  ||p" "{}" \; -exec basename "{}" \; | uniq -u

frankus

Keybase proof

I hereby claim:

• I am frankus on github.
• I am frankus (https://keybase.io/frankus) on keybase.
• I have a public key whose fingerprint is 2A7F B0A5 A84C 5A18 8750 94B6 242B C728 204F BB64

To claim this, I am signing this object:

frankus

+ (NSValueTransformer *)URLArrayTransformer {
    return [MTLValueTransformer reversibleTransformerWithForwardBlock:^NSArray *(NSArray *URLStrings) {
        NSMutableArray *result = [NSMutableArray arrayWithCapacity:[URLStrings count]];
        for (NSString *URLString in URLStrings) {
            [result addObject:[NSURL URLWithString:URLString]];
        }
        return result;
    } reverseBlock:^NSArray *(NSArray *URLs) {
        NSMutableArray *result = [NSMutableArray arrayWithCapacity:[URLs count]];
        for (NSURL *URL in URLs) {

frankus

//
//  ExtendedCollectionView.h
//
//  Created by Frank Schmitt on 7/11/14.
//

@interface ExtendedCollectionView : UICollectionView

@property (nonatomic) UIEdgeInsets touchAreaInsets;