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2012-10-15T23:25:01.977
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You could use the list as you do and as <code>cutch</code> mentioned manually add your own method to verify duplicates and sorting similar to the below. <pre><code>import 'dart:html'; var someList = new List<String>(); String newItem = ''; void main() { newItem = 'item 3'; if(!itemExistsInList(someList, newItem)){ someList.add(newItem); sortList(someList); } // expected item 3 print(someList); newItem = 'item 1'; if(!itemExistsInList(someList, newItem)){ someList.add(newItem); sortList(someList); } // expected item 1, item 3 print(someList); newItem = 'item 3'; if(!itemExistsInList(someList, newItem)){ someList.add(newItem); sortList(someList); } // expected item 1, item 3. Same as previous as secondary item 3 was not added print(someList); } // returns true if the specified item already exists in the specified list // otherwise false bool itemExistsInList(List<String> list, String item){ return list.some((v) => v.indexOf(item) != -1); } // sorts the list void sortList(List<String> list){ list.sort((a, b) => a.compareTo(b)); } </code></pre> You don't need to call the <code>sortList()</code> function every time you add, I only did this for demonstration. Only calling it when you actually need to is enough off course. <code>.sort()</code>, <code>.some()</code> and <code>.indexOf</code> are explained in more detail under the collections section of the <a href="http://www.dartlang.org/docs/library-tour/#collections" rel="nofollow">DART library documentation</a>
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1. POHow can I make Array (list) Elements Unique in Dart?
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1. CO@georgekoller: Has this helped you in any way or are you having still issues with this?
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2. CODart is still in Alpha and I have hesitated to start extending classes as it looks like many of the issues are being addressed almost daily. Your suggestion to use (v.indexOf(item) != -1) is what I have used and it seems to be working as expected and it should be efficient. Thanks again!
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