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cheap private java development cheap private java development kind_of?(Integer) @songs[key] else # ... end end end Again, testing this is pretty trivial. list[0] » Song: title1--artist1 (1) list[2] » Song: title3--artist3 (3) list[9] » nil Now we need to add the facility that lets us look up a song by title.

cheap private java development This is going to involve scanning through the songs in the list, checking the title of each. To do this, we first need to spend a couple of pages looking at one of Ruby's neatest features: iterators.Blocks and Iterators So, our next problem with SongList is to implement the code in method [] that takes a string and searches for a song with that title. This seems straightforward: we have an array of songs, so we just go through it one element at a time, looking for a match. class SongList def [](key) if key.

cheap private java development kind_of?(Integer) return @songs[key] else for i in 0...@songs.length return @songs[i] if key == @songs[i].

cheap private java development 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.

cheap private java development

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cheap private java development