A set of categories on Cocoa collection classes with several traversal and searching methods; inspired by Ruby's Enumerable Module http://www.ruby-doc.org/core/classes/Enumerable.html

rough support for NSArray is available e.g.

Animal* firstBiped = [animals detect:^(id obj) {
    return (BOOL)([(Animal*)obj numberOfLegs] == 2);
}];

NSArray* quadrupeds = [animals select:^(id obj) {
    return (BOOL)([(Animal*)obj numberOfLegs] == 4);
}];

BOOL containsArachnids = [animals any:^(id obj) {
    return (BOOL)([(Animal*)obj numberOfLegs] == 8);
}];

Mac OS X 10.6 SnowLeopard or later required due to block use.