block实现例子(介绍block的代码)

// // NSString+blocks.h // blocks // // Created by Robin Lu on 9/6/09. // Copyright 2009 __MyCompanyName__. All rights reserved. // #import <Cocoa/Cocoa.h> @interface NSArray (BlockExtension) - (void)each:(void (^)(id))block; - (NSArray* )select:(BOOL (^)(id))block; - (NSArray *)map:(id (^)(id))block; - (id)reduce:(id)initial withBlock:(id (^)(id,id))block; @end