Benchmark: spread vs obj assign

Tests:

spread

const firstObject = {
  a: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523],
  b: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  c: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  d: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  e: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  f: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  g: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  h: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  i: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  j: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  k: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  l: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  m: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  n: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
}
const secondObject = {
  1: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  2: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  3: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  4: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  5: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  6: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  7: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  8: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  9: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  10: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  11: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  12: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  13: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  14: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  15: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  16: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
}

const finalObject = {
	...firstObject,
  	...secondObject
};

​x
 
const firstObject = {  a: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523],  b: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  c: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  d: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  e: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  f: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  g: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  h: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  i: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  j: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  k: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  l: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  m: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  n: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},}const secondObject = {  1: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  2: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  3: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  4: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  5: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  6: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  7: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  8: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  9: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  10: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  11: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  12: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  13: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  14: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  15: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  16: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},}​const finalObject = {    ...firstObject,    ...secondObject};

assign

const firstObject = {
  a: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523],
  b: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  c: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  d: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  e: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  f: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  g: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  h: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  i: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  j: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  k: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  l: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  m: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  n: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
}

const secondObject = {
  1: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  2: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  3: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  4: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  5: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  6: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  7: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  8: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  9: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  10: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  11: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  12: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  13: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  14: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  15: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
  16: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},
}

const finalObject = Object.assign(firstObject, secondObject);

 
const firstObject = {  a: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523],  b: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  c: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  d: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  e: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  f: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  g: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  h: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  i: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  j: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  k: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  l: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  m: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  n: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},}​const secondObject = {  1: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  2: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  3: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  4: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  5: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  6: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  7: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  8: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  9: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  10: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  11: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  12: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  13: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  14: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  15: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},  16: { c: { d: 123, f: [1,2,3,4,5,6,7,34,4,6,6,7,457,34,57,3457,345,73,457,3457,345,734,573,457,3,25,35,23,52,35,235,23,52,35,235,2,35,235,235,23,523] }, dog: { cat: { lizard: "bird"}}},}​const finalObject = Object.assign(firstObject, secondObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
spread
assign

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36

Browser/OS: Chrome 77 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
spread	114677.5 Ops/sec
assign	113624.3 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 7 months ago):

A long block of code and benchmark results!

To answer your question, it appears that the benchmark is comparing the performance of two different methods:

Object.assign(): used in the code snippet to merge the firstObject and secondObject.
spread() (or another method): not shown in the code snippet, but presumably being compared to Object.assign().

The results suggest that Object.assign() is slightly faster than the other method.

Here's a simplified answer:

Object.assign() is generally faster than spread() for merging objects in JavaScript.

However, I must note that the results may vary depending on the specific use case, browser, and environment. Additionally, without more context or information about the spread() method being used, it's difficult to provide a definitive answer.

Would you like me to elaborate on any of these points?

LLMs can make mistakes. Check important info.

Related benchmarks:

spread vs obj assign (version: 0)

Comparing performance of: spread vs assign

Created: 5 years ago by: Guest

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