LHL W2D2 In Class Example

W2D2 In Class

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSError* error = nil;
        NSString* textString = [NSString stringWithContentsOfFile:@"/path/to/some/file.txt"
                                                         encoding:NSUTF8StringEncoding
                                                            error:&error];
        if (textString == nil) {
            NSLog(@"Something went wrong with reading the file: %@", error);
        }
        
        NSUInteger wordCount = 0;
        
        NSCharacterSet* separators = [NSCharacterSet whitespaceAndNewlineCharacterSet];
        NSArray* words = [textString componentsSeparatedByCharactersInSet:separators];
        wordCount = [words count];
        NSLog(@"There are %lu words in this file.", wordCount);
        
        NSMutableDictionary* listOfWords = [NSMutableDictionary dictionary];
        NSCharacterSet* trimmedCharacters = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
        for (NSString* w in words) {
            NSString* word = [w stringByTrimmingCharactersInSet:trimmedCharacters];
            NSNumber* currentCount = [listOfWords objectForKey:word];
            if (currentCount == nil) {
                listOfWords[word] = @1;
            }
            else {
                listOfWords[word] = @([currentCount integerValue] + 1);
            }
        }
        
        NSLog(@"Counts by word: \n%@", listOfWords);
    }
    return 0;
}