Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var arr   = [],
        hash  = {},
        max   = 10,
        mid   = 5,
        n, obj;
    
    for(n = 0 ; n < max ; n++) {
      obj = { id: n };
      arr.push(obj);
      hash[n] = obj;
    }
  };
</script>

Test runner

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arr.splice(mid, 1);

delete hash[mid]

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