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create wedding web site 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. class SongList def [](key) if key.kind_of?(Integer) @songs[key] else # .
create wedding web site .. 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. This is going to involve scanning through the songs in the list, checking the title of each.
create wedding web site 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.kind_of?(Integer) return @songs[key] else for i in 0.
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