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ssl ssl name end end return nil end end This works, and it looks comfortingly familiar: a for loop iterating over an array. What could be more natural? It turns out there is something more natural. In a way, our for loop is somewhat too intimate with the array; it asks for a length, then retrieves values in turn until it finds a match. Why not just ask the array to apply a test to each of its members? That's just what the find method in Array does. class SongList def [](key) if key.

ssl kind_of?(Integer) result = @songs[key] else result = @songs.find { |aSong| key == aSong.name } end return result end end We could use if as a statement modifier to shorten the code even more. class SongList def [](key) return @songs[key] if key.kind_of?(Integer) return @songs.

ssl find { |aSong| aSong.name == key } end end The method find is an iterator---a method that invokes a block of code repeatedly. Iterators and code blocks are among the more interesting features of Ruby, so let's spend a while looking into them (and in the process we'll find out exactly what that line of code in our [] method actually does).Implementing Iterators A Ruby iterator is simply a method that can invoke a block of code. At first sight, a block in Ruby looks just like a block in C, Java, or Perl.

ssl Unfortunately, in this case looks are deceiving---a Ruby block is a way of grouping statements, but not in the conventional way. First, a block may appear only in the source adjacent to a method call; the block is written starting on the same line as the method's last parameter. Second, the code in the block is not executed at the time it is encountered. Instead, Ruby remembers the context in which the block appears (the local variables, the current object, and so on), and then enters the method. This is where the magic starts.

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