This is usually a really difficult concept to grasp the first time.
You know how you can pass parameter objects to a method or constructor call in Java?
Well in Ruby you can also pass a very special kind of object as a parameter called a block or closure. It doesn't look like a normal object, its simply a set of curly braces containing some code.
3.times{ // do something in this block }
Here the times method is being called and is being passed a single block parameter (remember, the curly braces). It might be easier to visualize this if the syntax looked like: 3.times({ /* some code here */ }) because we're used to always seeing parameters inside of paranthesis.
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