packages/shared/util/Recoil_shallowArrayEqual.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails oncall+recoil
 * @flow strict
 * @format
 */

'use strict';

function shallowArrayEqual<TArr: $ReadOnlyArray<mixed>>(
  a: TArr,
  b: TArr,
): boolean {
  if (a === b) {
    return true;
  }

  if (a.length !== b.length) {
    return false;
  }

  for (let i = 0, l = a.length; i < l; i++) {
    if (a[i] !== b[i]) {
      return false;
    }
  }

  return true;
}

module.exports = shallowArrayEqual;