Measures performance of the variable assignment by destructuring. See my post here: https://twitter.com/biteofpie/status/1137079144301379586

ES2015 Var Destructuring.js

function bench (name, iterations = 500, fn) {
  const t0 = performance.now();

  for (let i = 0; i < iterations; i++) fn(i)

  
  let d = performance.now() - t0;
      d = Math.ceil(d);

  let ops = iterations / d;
      ops = Math.ceil(ops);
      ops = new Intl.NumberFormat('en').format(ops);
    
  console.log(`${name} took: ~%f ms  or  ~%s ops/ms`, d, ops)
}


obj = {
   abcd0: "foo0",
   abcd1: "foo1",
   abcd2: "foo2",
   abcd3: "fo03",
};


// Number of times we run the tests
iters = 10 ** 7;
console.clear();

// Normal variable assignments of obj props
bench(`assign object vars`, iters, function (i){
   var abcd0 = obj.abcd0;
   var abcd1 = obj.abcd1;
   var abcd2 = obj.abcd2;
   var abcd3 = obj.abcd3;

   return abcd0 + abcd1 + abcd2 + abcd3 + i;
});

// By destructuring
bench(`destruct object vars`, iters, function (i){
   var { abcd0, abcd1, abcd2, abcd3 } = obj;

   return abcd0 + abcd1 + abcd2 + abcd3 + i;
})

var i = 0;
// Asignment inside function parameters
bench(`destruct object func`, iters, function (i){
   (function({ abcd0, abcd1, abcd2, abcd3 }){

   return abcd0 + abcd1 + abcd2 + abcd3 + i;

   })(obj);
})