How to get the previous selected value from a dropdown before onchange

I know its the easiest question but cant get the correct answer

<div class="col-12 col-md-4 col-lg-5 mt10-xs">
     <div class="form-group FL mr20 w100-xs">
           <div class="rsi-custom-select">
                 <select class="form-control" id="statustab_{{ $row['placementkey'] }}" class="select2-selecting" onchange="listingByStatus(this,'{{ $row['placementkey'] }}')">
                     @foreach($placementStatus as $pl)
                        <option @if($pl['placement_status_id'] ==  $row['statusid'] ) selected @endif value="{{$pl['placement_status_key']}}">{{$pl['placement_status']}}</option>

This is my onchange function. In this How Can I get the previous Selected Value from my select box

function listingByStatus(ths,key){
      var thisSelect = $('#statustab_'+key).text();
      var statusText = $( "#statustab_"+key+" option:selected" ).text();
      var currentval = $( "#statustab_"+key+" option:selected" ).val();

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