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

You can use the following code to remove options with duplicate values.

    $(document).ready( function(){
        var a = new Array();
        $("#selectID").children("option").each(function(x){
            test = false;
            b = a[x] = $(this).val();
            for (i=0;i