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2013-02-11T22:21:59.850
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Context I have this raw data: <pre><code>data = name: first: 'alan' last: 'smith' age: 18 address: [ { name: 'work' street: '1600 amphitheatre parkway' city: 'mountain view' zip: 'CA 94043' },{ name: 'home' street: '1 infinite loop' city: 'cupertino' zip: 'CA 95014' }] </code></pre> And want to create a structure to manipulate my data like this : <pre><code>p = New Person(data) console.log """ #{p} # alan smith (18), 2 address lines #{p.name}, # alan smith #{p.name.first}, # alan #{p.address} # 2 address lines #{p.address.work} # 1600 amphitheatre parkway, mountain view, CA 94043 #{p.address.work.street} # 1600 amphitheatre parkway """ </code></pre> Additionally, I want to be able to apply custom methods to any member. For instance, assuming toCap() is a method that capitalises each word of a String : <pre><code>console.log """ #{p.name.toCap()}, # Alan Smith #{p.name.first.toCap()} # Alan #{p.address.work.toCap()} # 1600 Amphitheatre Parkway, Moutain View, CA 94043 #{p.address.work.street.toCap()} # 1600 Amphitheatre Parkway """ </code></pre> <hr> Solution (see this <a href="http://plnkr.co/edit/ovwj7z" rel="nofollow" title="See Plunk Here">Plunk</a> for the full code) <ul> <li>use nested classes <pre><code>class Person constructor: (data) -> @name = new Name(data.name) @address = new AddressList(data.address) </code></pre></li> <li>create members dynamically <pre><code>class AddressList constructor: (list) -> @[addr.name] = new Address(addr) for addr in list </code></pre></li> <li>wrap your properties or use base classes rather than extending native objects <pre><code>class StringProperty constructor: (@_value) -> toString: => @_value toCap: (remainingToLower=false) => _words = @_value.split ' ' (@_toCap(w,remainingToLower) for w in _words).join ' ' _toCap : (s, r) -> s[0].toUpperCase() + if r then s[1..-1].toLowerCase() else s[1..-1] </code></pre> ... and use them directly ... <pre><code>class Name constructor: (name) -> @first = new StringProperty(name.first) @last = new StringProperty(name.last) toString: => "#{@first} #{@last}" toCap: => "#{@first.toCap()} #{@last.toCap()}" </code></pre> ... or create members dynamically : <pre><code>@[k] = new StringProperty(data[k]) for k of data when k in Address.fields </code></pre></li> <li>don't forget to override toString() as above</li> </ul>
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