Run results for: Object creation vs assign

Test name	Executions per second
✓ New object	878,657,024 Ops/sec
Spread	41,364,092 Ops/sec
Assign	3,637,808 Ops/sec

New object

function createObject(total) {
  return {
      a: 1,
      b: 1,
      c: 1,
      d: 1,
      e: 1,
      f: 1,
      g: 1,
      h: 1,
      i: 1,
      j: 1,
      k: 1,
      l: 1,
      total: total
  }
}

createObject(1)

Spread

const firstObject = { 
	a: 1,
    b: 1,
    c: 1,
	d: 1,
    e: 1,
    f: 1,
	g: 1,
    h: 1,
    i: 1,
	j: 1,
    k: 1,
    l: 1,
}
function createObject(total) {
	return {
      ...firstObject,
      total: total
    }
}
createObject(1)

Assign

const firstObject = { 
	a: 1,
    b: 1,
    c: 1,
	d: 1,
    e: 1,
    f: 1,
	g: 1,
    h: 1,
    i: 1,
	j: 1,
    k: 1,
    l: 1,
}
function createObject(total) { 
  return Object.assign({ total: total }, firstObject);
}

createObject(1)