@wordpress/is-shallow-equal/build-module/objects.js

Test for shallow equality between two objects or arrays.

/**
 * Internal dependencies
 */

/**
 * Returns true if the two objects are shallow equal, or false otherwise.
 *
 * @param a First object to compare.
 * @param b Second object to compare.
 *
 * @return Whether the two objects are shallow equal.
 */
export default function isShallowEqualObjects(a, b) {
  if (a === b) {
    return true;
  }
  const aKeys = Object.keys(a);
  const bKeys = Object.keys(b);
  if (aKeys.length !== bKeys.length) {
    return false;
  }
  let i = 0;
  while (i < aKeys.length) {
    const key = aKeys[i];
    const aValue = a[key];
    if (
    // In iterating only the keys of the first object after verifying
    // equal lengths, account for the case that an explicit `undefined`
    // value in the first is implicitly undefined in the second.
    //
    // Example: isShallowEqualObjects( { a: undefined }, { b: 5 } )
    aValue === undefined && !b.hasOwnProperty(key) || aValue !== b[key]) {
      return false;
    }
    i++;
  }
  return true;
}
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