Underscore.m is a small utility library to facilitate working with common data structures in Objective-C.
It tries to encourage chaining by eschewing the square bracket]]]]]].
It is inspired by the awesome underscore.js.
// First, let's compose a twitter search requestNSURL *twitterSearch = [NSURLURLWithString:@"http://search.twitter.com/search.json?q=@SoundCloud&rpp=100"];
// ... then we fetch us some json ...NSData *data = [NSDatadataWithContentsOfURL:twitterSearch];
// ... and parse it.NSDictionary *json = [NSJSONSerializationJSONObjectWithData:data
options:kNilOptionserror:NULL];
// This is where the fun starts!NSArray *tweets = [json valueForKey:@"results"];
NSArray *processed = _array(tweets)
// Let's make sure that we only operate on NSDictionaries, you never// know with these APIs ;-)
.filter(Underscore.isDictionary)
// Remove all tweets that are in English
.reject(^BOOL (NSDictionary *tweet) {
return [[tweet valueForKey:@"iso_language_code"] isEqualToString:@"en"];
})
// Create a simple string representation for every tweet
.map(^NSString *(NSDictionary *tweet) {
NSString *name = [tweet valueForKey:@"from_user_name"];
NSString *text = [tweet valueForKey:@"text"];
return [NSStringstringWithFormat:@"%@: %@", name, text];
})
.unwrap;Documentation for Underscore.m can be found on the website.