Sha256: 0370fa0f9268ffadceae6a8f600ce3165d3448d195b63a8b5989d0e028ba6cb5
Contents?: true
Size: 1.09 KB
Versions: 226
Compression:
Stored size: 1.09 KB
Contents
#import "LuhnExample.h"
@implementation Luhn
- (instancetype)initWithString:(NSString *)string {
self = [super init];
if (self) {
_isValid = [Luhn validateString:string];
}
return self;
}
+ (BOOL)validateString:(NSString *)string {
string = [string stringByReplacingOccurrencesOfString:@" " withString:@""]; //!OCLint
if (string.length < 2) {
return NO;
}
NSCharacterSet *digitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
if ([string rangeOfCharacterFromSet:digitCharacterSet].location != NSNotFound) {
return NO;
}
int total = 0;
for (int i = 1; i <= string.length; i++) {
NSString *character = [NSString stringWithFormat:@"%c", [string characterAtIndex:string.length - i]];
int digit = character.intValue;
if (i % 2 == 0) {
digit *= 2;
if (digit > 9) {
digit -= 9;
}
}
total += digit;
}
if (total % 10 == 0) {
return YES;
}
return NO;
}
@end
Version data entries
226 entries across 226 versions & 1 rubygems