reach-et-deep_equals/lib/deep_equals.js

To deep compare objects

/* eslint-disable no-use-before-define */

import { isObject } from 'reach-et-utilities/dist/checks';

function deepEqual(value1, value2) {
  if (Array.isArray(value1) && Array.isArray(value2)) {
    return arrayDeepEqual(value1, value2);
  }
  if (isObject(value1) && isObject(value2)) {
    return objectDeepEqual(value1, value2);
  }
  return value1 === value2;
}

function objectDeepEqual(object1, object2) {
  const keys1 = Object.keys(object1);
  const keys2 = Object.keys(object2);

  if (keys1.length !== keys2.length) {
    return false;
  }

  for (const key of keys1) {
    const val1 = object1[key];
    const val2 = object2[key];
    if (!deepEqual(val1, val2)) {
      return false;
    }
  }

  return true;
}

function arrayDeepEqual(array1, array2) {
  if (array1.length !== array2.length) {
    return false;
  }

  for (let i = 0; i < array1.length; i += 1) {
    const val1 = array1[i];
    const val2 = array2[i];
    if (!deepEqual(val1, val2)) {
      return false;
    }
  }

  return true;
}

export default deepEqual;
/* eslint-enable no-use-before-define */