Preparation code

      
      <script>

        Benchmark.prototype.setup = function() {

          
  if (typeof Object.assign != 'function') {
    // Must be writable: true, enumerable: false, configurable: true
    Object.defineProperty(Object, "assign", {
      value: function assign(target, varArgs) { // .length of function is 2

        'use strict';
        if (target == null) { // TypeError if undefined or null
          throw new TypeError('Cannot convert undefined or null to object');
        }
  
        var to = Object(target);
  
        for (var index = 1; index < arguments.length; index++) {
          var nextSource = arguments[index];
  
          if (nextSource != null) { // Skip over if undefined or null
            for (var nextKey in nextSource) {
              // Avoid bugs when hasOwnProperty is shadowed
              if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
                to[nextKey] = nextSource[nextKey];
              }
            }
          }
        }
        return to;
      },
      writable: true,
      configurable: true
    });
  }
  var x = {};
  for (var i = 0; i < 1000000; i += 1) {
    x[i] = i;
  }
        
  };


      
</script>
    

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x = Object.assign({}, x, {foo: 'bar'});

x = { ...x, foo: 'bar' }

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