Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    obj = {x: 10, y: 10}
    
    function withObject(obj) {
       return {x : obj.x + 10, y : obj.y + 10};
    }
    
    function withObjectReturnsArray(obj) {
       return [obj.x + 10, obj.y + 10];
    }
    
    function withObjectInplace(obj) {
       obj.x = obj.x + 10; obj.y = obj.y + 10;
       return obj;
    }
    
    function withArgumentsReturnsArray(x, y) {
       return [x + 10, y + 10];
    }
    
    function withArguments(x, y) {
       return {x: x + 10, y: y + 10};
    }
  };
</script>

Test runner

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withObject(obj);

withArguments(10, 10);

withArgumentsReturnsArray(10, 10);

withObjectReturnsArray(10, 10);

withObjectInplace(obj);

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