omit-benchmark.js

const Benchmark = require('benchmark');
const _ = require('lodash');

const props = {
  className: 'foo',
  onClick: () => null,
  children: 'bar',
  style: { top: 10 },
  relay: {},
  intl: {},
};

function customOmit(obj, keys) {
  const retVal = {};
  Object.keys(obj).forEach(key => {
    if (keys.indexOf(key) === -1) {
      retVal[key] = obj[key];
    }
  });
  return retVal;
}

console.log('_.omit', _.omit(props, ['relay', 'intl']));
console.log('customOmit', customOmit(props, ['relay', 'intl']));

const suite = new Benchmark.Suite;

suite
  .add('_.omit', () => (
    _.omit(props, ['relay', 'intl'])
  ))
  .add('customOmit', () => (
    customOmit(props, ['relay', 'intl'])
  ))
  .on('complete', () => {
    suite.forEach(benchmark => {
      console.log(benchmark.toString());
    });
  })
  .run();