#import   @interface WordFrequencyCounter : NSObject   @property (nonatomic, strong) NSMutableDictionary*wordCounts;   @end     @implementation WordFrequencyCounter   - (id)initWithText:(NSString*)text   {     self = [super init];     self.wordCounts = [[NSMutableDictionary alloc] init];     [self analyzeText:text];     return self;   }     - (void)analyzeText:(NSString*)text   {     NSCharacterSet*whitespaces = [NSCharacterSet whitespaceAndNewlineCharacterSet];     [text componentsSeparatedBy:whitespaces].enumerated.forEach:^      NSRegularExpression*regex = [NSRegularExpression regularExpressionWithPattern:@"\\b\\w+\\b"];       NSTextCheckingResult*matchResult = [regex firstMatchIn:text options:0 range:NSMakeRange(0, text.length)];       if (matchResult       {         NSString*word = [matchResult match];         [self.wordCounts setValue:[NSNumber numberWithInt: [self.wordCounts valueForKey:word] ? [self.wordCounts valueForKey:word] : 0] forKey:word];       }     }];   }     - (NSString*)frequencyReport   {     NSMutableString*report = [NSMutableString new];     [self.wordCounts keys].sorted.forEach:^(id word)<{       int count = [self.wordCounts valueForKey:word] ? [self.wordCounts valueForKey:word] : 0;       if (count > 0)       {         [report appendFormat:@"%@: %d\n", word, count];       }     }];     return [report string];   }