Chapter 10. Blocks, Procs, and Lambdas
When programmers talk about blocks, they often mean some arbitrary “chunks” of code. In Ruby, however, a block is special. It is a unit of code that works somewhat like a method but, unlike a method, it has no name.
Blocks are very important in Ruby, but they can be difficult to understand. In addition, there are some important differences in the behavior of blocks in Ruby 1.8 and Ruby 1.9. If you fail to appreciate those differences, your programs may behave in unexpected ways when run in different versions of Ruby. This chapter looks at blocks in great detail. Not only does it explain how they work and why ...
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