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create wedding web site create wedding web site ..@songs.length return @songs[i] if key == @songs[i].name end end return nil end end This works, and it looks comfortingly familiar: a for loop iterating over an array.

create wedding web site 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.kind_of?(Integer) result = @songs[key] else result = @songs.

create wedding web site 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.find { |aSong| aSong.

create wedding web site 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. Unfortunately, in this case looks are deceiving---a Ruby block is a way of grouping statements, but not in the conventional way.

create wedding web site

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create wedding web site