Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Blocks are a nonstandard extension added by Apple Inc. to the C, C++, and Objective-C programming languages that uses a lambda expression-like syntax to create closures within these languages. Apple designed blocks with the explicit goal of making it easier to write programs for the Grand Central Dispatch threading architecture, although it is independent of that architecture and can be used in much the same way as closures in other languages. Apple has implemented blocks in Apple's own copy of the GCC sources and in the Clang LLVM compiler front end. Language runtime library support for blocks is also available as part of the LLVM project.

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