The Pragmatic Studio | Using Blocks in iOS 4: The Basics

“The Pragmatic Studio | Blog”

iOS 4 introduces one new feature that will fundamentally change the way you program in general: blocks. Blocks are an extension to the C language and thus fully supported in Objective-C. If you're coming from a programming language such as Ruby, Python, or Lisp, then you know the power of blocks. Simply put, blocks let you encapsulate chunks of code and pass them around like any other object. It's a different style of programming that you'll want to become familiar with to take advantage of new APIs in iOS 4.

Full article: http://pragmaticstudio.com/blog/2010/7/28/ios4-blocks-1