react-redux-provide/src/shallowEqual.js

Build your UI with React. Manage application state with Redux providers. Persist and share application state with replication. Use pure functions everywhere.

export default function shallowEqual(objA, objB) {
  if (objA === objB) {
    return true;
  }

  if (!objA || typeof objA !== 'object' || !objB || typeof objB !== 'object') {
    return false;
  }

  const keysA = Object.keys(objA);
  const keysB = Object.keys(objB);

  if (keysA.length !== keysB.length) {
    return false;
  }

  // Test for A's keys different from B.
  const hasOwn = Object.prototype.hasOwnProperty;
  for (let i = 0; i < keysA.length; i++) {
    if (!hasOwn.call(objB, keysA[i]) || objA[keysA[i]] !== objB[keysA[i]]) {
      return false;
    }
  }

  return true;
}