How to Remove duplicate dropdown option elements with same value

Question

How can I remove duplicate values -> drop down option elements?
I have the following HTML:

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Answer 1

How about this.

DEMO :http://jsfiddle.net/naokiota/yayTm/2/

var exist = {};
$('select > option').each(function() {
    if (exist[$(this).val()]){
        $(this).remove();
    }else{
        exist[$(this).val()] = true;
    }
});

Hope this helps.