Preparation code

      
      <script>

        Benchmark.prototype.setup = function() {

          
  var a = {one:1, two:2, three:3, four:4, five:5, six:6, seven:7};
  
  var b;
  
  function import$(obj, src){
    var own = {}.hasOwnProperty;
    for (var key in src) if (own.call(src, key)) obj[key] = src[key];
    return obj;
  }
  
  function import$$(obj, src) {
    for (var key in src) {
      if (obj.hasOwnProperty(key)) {
        obj[key] = src[key];
      }
    }
    return obj;
  }
  
  function import$$$(obj, src) {
    for (var key in src) {
      if (Object.hasOwnProperty.call(obj, key)) {
        obj[key] = src[key];
      }
    }
    return obj;
  }
        
  };


      
</script>
    

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b = {...a};

b = import$({}, a);

b = Object.assign({}, a);

b = import$$({}, a);

b = import$$$({}, a);

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