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affordable web hosting web space provider deleteLast » Song: title4--artist4 (4) list.deleteLast » Song: title3--artist3 (3) list.deleteLast » nil So far so good. Our next method is [], which accesses elements by index. If the index is a number (which we check using Object#kind_of? ), we just return the element at that position.
affordable web hosting web space provider class SongList def [](key) if key.kind_of?(Integer) @songs[key] else # ... end end end Again, testing this is pretty trivial.
affordable web hosting web space provider 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. 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.
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