Run results for: Updating objects w spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Assign	451726.0 Ops/sec
Spread	755838.7 Ops/sec
Literal	23320190.0 Ops/sec

Script Preparation code:

setC = (v, o) => ({
  a: o.a,
  b: o.b,
  c: v,
  d: o.d,
  e: o.e,
  f: o.f,
  g: o.g,
  h: o.h,
  i: o.i,
  j: o.j,
  k: o.k,
  l: o.l,
  m: o.m,
  n: o.n,
  o: o.o,
  p: o.p,
  q: o.q,
  r: o.r,
  s: o.s,
  t: o.t,
  u: o.u,
  v: o.v,
  w: o.w,
  x: o.x,
  y: o.y,
  z: o.z
})

o = {
  a: 1,
  b: 2,
  c: 3,
  d: 4,
  e: 5,
  f: 6,
  g: 7,
  h: 8,
  i: 9,
  j: 10,
  k: 11,
  l: 12,
  m: 13,
  n: 14,
  o: 15,
  p: 16,
  q: 17,
  r: 18,
  s: 19,
  t: 20,
  u: 21,
  v: 22,
  w: 23,
  x: 24,
  y: 25,
  z: 26
};

Tests:

Assign
assign = Object.assign({}, o, {c: 4});
Spread
spread = {...o, c: 4};
Literal
literal = setC(4, o)

Run results for: Updating objects w spread

Assign

Spread

Literal