underscore.m

// With dot syntax (and standard Xcode indentation, just hit "Cmd-I")

NSArray *tweets = Underscore.array(results)
.filter(Underscore.isDictionary)
.reject(^BOOL (NSDictionary *tweet) {
  return [tweet[@"iso_language_code"] isEqualToString:@"en"];
})
.map(^NSString *(NSDictionary *tweet) {
  NSString *name = tweet[@"from_user_name"];
  NSString *text = tweet[@"text"];

  return [NSString stringWithFormat:@"%@: %@", name, text];
})
.unwrap;


// With normal ObjC syntax, no dot-abuse. (And hit "Cmd-I" to indent)

NSArray *tweets = [[[[Underscore.array(tweets)
                      filter](Underscore.isDictionary)
                     reject](^BOOL (NSDictionary *tweet) {
  return [tweet[@"iso_language_code"] isEqualToString:@"en"];
})
                    map](^NSString *(NSDictionary *tweet) {
  NSString *name = tweet[@"from_user_name"];
  NSString *text = tweet[@"text"];

  return [NSString stringWithFormat:@"%@: %@", name, text];
})
                   unwrap];



// Dot syntax with best indentation (hit Cmd-] once to move all the lines over)

NSArray *tweets = Underscore.array(results)
  .filter(Underscore.isDictionary)
  .reject(^BOOL (NSDictionary *tweet) {
    return [tweet[@"iso_language_code"] isEqualToString:@"en"];
  })
  .map(^NSString *(NSDictionary *tweet) {
    NSString *name = tweet[@"from_user_name"];
    NSString *text = tweet[@"text"];

    return [NSString stringWithFormat:@"%@: %@", name, text];
  })
  .unwrap;


// Normal syntax with equivalent indentation (by hand), to take out the indenting issue
// Compare readability of  ".map(" versus "map]("
// Also consider the impact of adding another filter to this chain.

NSArray *tweets = [[[[Underscore.array(tweets)
  filter](Underscore.isDictionary)
  reject](^BOOL (NSDictionary *tweet) {
    return [tweet[@"iso_language_code"] isEqualToString:@"en"];
  })
  map](^NSString *(NSDictionary *tweet) {
    NSString *name = tweet[@"from_user_name"];
    NSString *text = tweet[@"text"];

    return [NSString stringWithFormat:@"%@: %@", name, text];
  })
  unwrap];


// For total fairness, here's the traditional (non-functional, no blocks) approach:

NSMutableArray *tweets = [NSMutableArray new];
for (NSDictionary *tweet in results) {
  if (! [tweet isKindOfClass:[NSDictionary class]]) {
    continue;
  }

  if ([tweet[@"iso_language_code"] isEqualToString:@"en"]) {
    continue;
  }

  NSString *name = tweet[@"from_user_name"];
  NSString *text = tweet[@"text"];

  [tweets addObject:[NSString stringWithFormat:@"%@: %@", name, text]];
}