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browser-based web site construction browser-based web site construction 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. So, our next problem with 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.

browser-based web site construction kind_of?(Integer) return @songs[key] else for i in 0...@songs.length return @songs[i] if key == @songs[i].

browser-based web site construction name end end return nil end end This works, and it looks comfortingly familiar: a loop iterating over an array. What could be more natural? It turns out there something more natural. In a way, our 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 does. class SongList def [](key) if key.

browser-based web site construction

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browser-based web site construction