advantis

func isLuhnValid(number: String) -> Bool {
    let asciiOffset: UInt8 = 48
    let digits = Array(number.utf8).reverse().map{$0 - asciiOffset}

    let convert: (UInt8) -> (UInt8) = {
        let n = $0 * 2
        return n > 9 ? n - 9 : n
    }

    var sum: UInt8 = 0

advantis

func isLuhnValid(number: String) -> Bool {
    let asciiOffset: UInt8 = 48
    let convert: (UInt8) -> (UInt8) = {
        let n = $0 * 2
        return n > 9 ? n - 9 : n
    }
    let digits = Array(number.utf8).reverse().map{$0 - asciiOffset}
    let indices = Array(0..digits.count)
    let evens = indices.filter{$0 & 1 == 0}.map{digits[$0]}
    let odds = indices.filter{$0 & 1 == 1}.map{digits[$0]}.map(convert)

advantis

operator infix || {}
@infix func ||<T>(lhs: T?, rhs: T) -> T {
    return lhs ? lhs! : rhs
}

advantis

-- Adapted from these sources:
-- http://peterdowns.com/posts/open-iterm-finder-service.html
-- https://gist.github.com/cowboy/905546
-- 
-- Modified to work with files as well, cd-ing to their container folder
on run {input, parameters}
  tell application "Finder"
		set my_file to first item of input
		set filetype to (kind of (info for my_file))
		-- Treats OS X applications as files.  To treat them as folders, integrate this SO answer:

advantis

//
//  Copyright © 2014 Yuri Kotov
//

#import <UIKit/UIKit.h>

@interface ADVTabViewController : UIViewController

@property (nonatomic) NSUInteger selectedIndex;
@property (nonatomic, copy) NSArray *viewControllers;

advantis

#ifndef NS_DESIGNATED_INITIALIZER
#if __has_attribute(objc_designated_initializer)
#define NS_DESIGNATED_INITIALIZER __attribute((objc_designated_initializer))
#else
#define NS_DESIGNATED_INITIALIZER
#endif
#endif

advantis

//
//  Copyright © 2014 Yuri Kotov
//

#import <UIKit/UIKit.h>

@interface ADVDiscreteSlider : UISlider

@property (nonatomic) float unitValue;

advantis

//
//  Copyright © 2014 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface NSObject (ADVDescription)

- (NSString *) autoDescription;

advantis

//
//  Copyright © 2013 Yuri Kotov
//

#import <CoreData/CoreData.h>

@interface NSManagedObject (ADVCopying)

- (instancetype) adv_copyInContext:(NSManagedObjectContext *)context;

advantis

//
//  Copyright © 2012 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface NSData (ADVHexadecimalRepresentation)

- (NSString *) hexadecimalRepresentation;