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cheap private java development cheap private java development 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.

cheap private java development 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.

cheap private java development 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.

cheap private java development Within the method, the block may be invoked, almost as if it were a method itself, using the yield statement. Whenever a yield is executed, it invokes the code in the block. When the block exits, control picks back up immediately after theyield.[Programming-language buffs will be pleased to know that the keyword yield was chosen to echo the yield function in Liskov's language CLU, a language that is over 20 years old and yet contains features that still haven't been widely exploited by the CLU-less.] Let's start with a trivial example.

cheap private java development

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cheap private java development