Smalltalk enumeration methods for Objective-C

Adds the typical SmallTalk enumeration methods to NSArray, NSSet, and NSDictionary.

The usual suspects are do:, select:, collect:, but I also have do:separatedBy:, inject:into:, and friends.

##Example

Enumerating all elements of an array and printing their descriptions to stdout can be achieved with

    [array do:^(id each){ NSLog([each description]); }];

Which is not as nice as

    array do: [:each | Transcript println:each toString].

But a whole lot nicer than

[array enumerateObjectsUsingBlock:^(id object, NSUInteger index, BOOL *stop){
        NSLog([each description]);
}];

Likewise, collect: and select: provide methods for mapping and reducing respectively.

NSArray *array = [NSArray arrayWithObjects:[NSNumber numberWithInteger:1], 
    [NSNumber numberWithInteger:2], [NSNumber numberWithInteger:3], 
    [NSNumber numberWithInteger:4], [NSNumber numberWithInteger:5], nil];
    [array collect:^id(id each) { return [each description]; }]; // {@"1", @"2", @"3", @"4", @"5"}
    [array select:^BOOL(id each) { return [each integerValue] % 2; }]; // {1, 3, 5}

#Requires

This code uses Objective-C blocks and therefore can only target Mac OSX 10.6 or better. #License

Generic MIT License