spread vs object.assign 2

Benchmark created on

Setup

var __defProp = Object.defineProperty;
var __defProps = Object.defineProperties;
var __getOwnPropDescs = Object.getOwnPropertyDescriptors;
var __getOwnPropSymbols = Object.getOwnPropertySymbols;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __propIsEnum = Object.prototype.propertyIsEnumerable;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __spreadValues = (a, b) => {
  for (var prop in b ||= {})
    if (__hasOwnProp.call(b, prop))
      __defNormalProp(a, prop, b[prop]);
  if (__getOwnPropSymbols)
    for (var prop of __getOwnPropSymbols(b)) {
      if (__propIsEnum.call(b, prop))
        __defNormalProp(a, prop, b[prop]);
    }
  return a;
};
var __spreadProps = (a, b) => __defProps(a, __getOwnPropDescs(b));

Test runner

Ready to run.

Testing in
TestOps/sec
spread
function objectSpread(m, n) {  
  return {...m, ...n};  
}  
  
function objectAssign(m, n) {  
  return Object.assign({}, m, n);  
}  
  
function f(i) {  
  const m = {}, n = {};  
  for (let k = 0; k < i; k++) {  
    m[Math.random()] = 0;  
    n[Math.random()] = 0;  
  }  
  return objectSpread(m, n);  
}  
  
const a = [];  
for (let j = 0; j < 5625; j++) {  
  a.push(f(75));  
}
ready
object.assign
function objectSpread(m, n) {  
  return {...m, ...n};  
}  
  
function objectAssign(m, n) {  
  return Object.assign({}, m, n);  
}  
  
function f(i) {  
  const m = {}, n = {};  
  for (let k = 0; k < i; k++) {  
    m[Math.random()] = 0;  
    n[Math.random()] = 0;  
  }  
  return objectAssign(m, n);  
}  
  
const a = [];  
for (let j = 0; j < 5625; j++) {  
  a.push(f(75));  
}
ready
spread polifill
function objectSpreadPolifill(m, n) {  
  return __spreadValues(__spreadValues({}, m), n);  
}  
  
function f(i) {  
  const m = {}, n = {};  
  for (let k = 0; k < i; k++) {  
    m[Math.random()] = 0;  
    n[Math.random()] = 0;  
  }  
  return objectSpreadPolifill(m, n);  
}  
  
const a = [];  
for (let j = 0; j < 5625; j++) {  
  a.push(f(75));  
}
ready

Revisions

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