shallow-comparison-p4.js

import hasOwnProperty from './hasOwnProperty';
function shallowEqual(objA: mixed, objB: mixed): boolean {
	// ...
  // Test for A's keys different from B.
  for (let i = 0; i < keysA.length; i++) {
    const currentKey = keysA[i];
    if (
      !hasOwnProperty.call(objB, currentKey) ||
      !is(objA[currentKey], objB[currentKey])
    ) {
      return false;
    }
  }
  return true;
}