react-elegant-ui/lib/isEqual.js

Elegant UI components, made by BEM best practices for react

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.isEqual = isEqual;
// Imported from yandex-ui. Source: https://github.com/bem/yandex-ui/
/**
 * Util who compare two objects to equal values
 *
 * Basics on [react-fast-compare](https://github.com/FormidableLabs/react-fast-compare)
 * but removed checks to unnecessary data structs.
 */
function isEqual(a, b) {
  if (a === b) return true;
  if (a && b && typeof a === 'object' && typeof b === 'object') {
    if (a.constructor !== b.constructor) return false;
    var length_1;
    var i = void 0;
    if (Array.isArray(a)) {
      length_1 = a.length;
      if (length_1 !== b.length) return false;
      for (i = length_1; i-- !== 0;) if (!isEqual(a[i], b[i])) return false;
      return true;
    }
    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
    var keys = Object.keys(a);
    length_1 = keys.length;
    if (length_1 !== Object.keys(b).length) return false;
    for (i = length_1; i-- !== 0;) if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
    if (typeof Element !== 'undefined' && a instanceof Element) return false;
    for (i = length_1; i-- !== 0;) {
      if ((keys[i] === '_owner' || keys[i] === '__v' || keys[i] === '__o') && a.$$typeof) {
        continue;
      }
      if (!isEqual(a[keys[i]], b[keys[i]])) return false;
    }
    return true;
  }
  return a !== a && b !== b;
}